400 lines
21 KiB
JSON
400 lines
21 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-53427",
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"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"state": "PUBLISHED",
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"assignerShortName": "EEF",
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"dateReserved": "2026-06-09T11:01:47.529Z",
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"datePublished": "2026-06-29T18:50:17.185Z",
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"dateUpdated": "2026-06-30T04:37:51.902Z"
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},
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"containers": {
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"cna": {
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"affected": [
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{
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"collectionURL": "https://repo.hex.pm",
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"cpes": [
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"cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.MDEx'",
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"comrak_nif"
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],
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"packageName": "mdex",
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"packageURL": "pkg:hex/mdex",
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"product": "mdex",
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"programFiles": [
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"native/comrak_nif/src/lumis_adapter.rs"
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],
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"programRoutines": [
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{
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"name": "comrak_nif::lumis_adapter::LumisAdapter::parse_custom_attributes"
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},
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{
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"name": "comrak_nif::lumis_adapter::LumisAdapter::highlight_lines_config"
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},
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{
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"name": "comrak_nif::lumis_adapter::LumisAdapter::write_highlighted"
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},
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{
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"name": "'Elixir.MDEx':to_html/2"
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}
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],
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"repo": "https://github.com/leandrocp/mdex",
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"vendor": "leandrocp",
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"versions": [
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{
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"lessThan": "0.12.3",
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"status": "affected",
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"version": "0.11.3",
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"versionType": "semver"
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}
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]
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},
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{
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"collectionURL": "https://github.com",
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"cpes": [
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"cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.MDEx'",
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"comrak_nif"
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],
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"packageName": "leandrocp/mdex",
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"packageURL": "pkg:github/leandrocp/mdex",
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"product": "mdex",
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"programFiles": [
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"native/comrak_nif/src/lumis_adapter.rs"
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],
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"programRoutines": [
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{
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"name": "comrak_nif::lumis_adapter::LumisAdapter::parse_custom_attributes"
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},
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{
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"name": "comrak_nif::lumis_adapter::LumisAdapter::highlight_lines_config"
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},
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{
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"name": "comrak_nif::lumis_adapter::LumisAdapter::write_highlighted"
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},
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{
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"name": "'Elixir.MDEx':to_html/2"
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}
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],
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"repo": "https://github.com/leandrocp/mdex",
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"vendor": "leandrocp",
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"versions": [
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{
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"lessThan": "6ed94d905f97af188323f042698ae841c02293b4",
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"status": "affected",
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"version": "0d7ffc84ea742e1daf666426814e5bb6d0499433",
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"versionType": "git"
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}
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]
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},
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{
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"collectionURL": "https://repo.hex.pm",
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"cpes": [
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"cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.MDExNative.Comrak'",
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"mdex_native_nif"
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],
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"packageName": "mdex_native",
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"packageURL": "pkg:hex/mdex_native",
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"product": "mdex_native",
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"programFiles": [
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"native/mdex_native_nif/src/lumis_adapter.rs"
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],
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"programRoutines": [
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{
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"name": "mdex_native_nif::lumis_adapter::LumisAdapter::parse_custom_attributes"
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},
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{
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"name": "mdex_native_nif::lumis_adapter::LumisAdapter::highlight_lines_config"
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},
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{
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"name": "mdex_native_nif::lumis_adapter::LumisAdapter::write_highlighted"
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},
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{
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"name": "'Elixir.MDExNative.Native':document_to_html_with_options/2"
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},
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{
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"name": "'Elixir.MDExNative.Comrak':document_to_html/2"
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}
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],
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"repo": "https://github.com/leandrocp/mdex_native",
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"vendor": "leandrocp",
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"versions": [
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{
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"lessThan": "0.2.3",
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"status": "affected",
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"version": "0.1.0",
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"versionType": "semver"
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}
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]
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},
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{
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"collectionURL": "https://github.com",
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"cpes": [
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"cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.MDExNative.Comrak'",
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"mdex_native_nif"
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],
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"packageName": "leandrocp/mdex_native",
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"packageURL": "pkg:github/leandrocp/mdex_native",
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"product": "mdex_native",
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"programFiles": [
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"native/mdex_native_nif/src/lumis_adapter.rs"
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],
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"programRoutines": [
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{
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"name": "mdex_native_nif::lumis_adapter::LumisAdapter::parse_custom_attributes"
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},
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{
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"name": "mdex_native_nif::lumis_adapter::LumisAdapter::highlight_lines_config"
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},
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{
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"name": "mdex_native_nif::lumis_adapter::LumisAdapter::write_highlighted"
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},
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{
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"name": "'Elixir.MDExNative.Native':document_to_html_with_options/2"
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},
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{
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"name": "'Elixir.MDExNative.Comrak':document_to_html/2"
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}
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],
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"repo": "https://github.com/leandrocp/mdex_native",
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"vendor": "leandrocp",
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"versions": [
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{
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"lessThan": "798a363b4339f6f7162ec8437c4c9f9b5ae6fbf3",
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"status": "affected",
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"version": "956528c5e31746253347029e810a969ab916fd27",
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"versionType": "git"
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}
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]
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}
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],
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"configurations": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>The vulnerable code path is only reachable when MDEx is configured with a syntax-highlighting formatter (for example <tt>syntax_highlight: [formatter: {:html_inline, ...}]</tt> or <tt>{:html_linked, ...}</tt>) and with full info-string forwarding enabled (<tt>render: [full_info_string: true]</tt>). Full info-string forwarding is required for comrak to hand the <tt>highlight_lines_class</tt> attribute to the highlighter, so any application that uses the line-highlighting attributes already has it enabled.</p>"
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}
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],
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"value": "The vulnerable code path is only reachable when MDEx is configured with a syntax-highlighting formatter (for example syntax_highlight: [formatter: {:html_inline, ...}] or {:html_linked, ...}) and with full info-string forwarding enabled (render: [full_info_string: true]). Full info-string forwarding is required for comrak to hand the highlight_lines_class attribute to the highlighter, so any application that uses the line-highlighting attributes already has it enabled."
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"cpeMatch": [
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{
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"criteria": "cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "0.12.3",
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"versionStartIncluding": "0.11.3",
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"vulnerable": true
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}
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],
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"negate": false,
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"operator": "AND"
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},
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{
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"cpeMatch": [
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{
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"criteria": "cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "0.2.3",
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"versionStartIncluding": "0.1.0",
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"vulnerable": true
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}
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],
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"negate": false,
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"operator": "AND"
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}
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],
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"operator": "OR"
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}
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],
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"credits": [
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{
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"lang": "en",
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"type": "finder",
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"value": "Peter Ullrich"
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},
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{
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"lang": "en",
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"type": "remediation developer",
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"value": "Leandro Pereira"
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},
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{
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"lang": "en",
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"type": "analyst",
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"value": "Jonatan Männchen / EEF"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in leandrocp MDEx allows stored or reflected cross-site scripting via attacker-controlled Markdown.</p><p>When syntax highlighting and full info-string forwarding (<tt>render: [full_info_string: true]</tt>) are enabled, the Lumis adapter copies the value of a code fence's <tt>highlight_lines_class</tt> info-string attribute, unescaped, into the <tt>class</tt> attribute of every rendered line. <tt>comrak_nif::lumis_adapter::LumisAdapter::parse_custom_attributes</tt> in <tt>native/comrak_nif/src/lumis_adapter.rs</tt> shlex-parses the info string and stores each <tt>key=value</tt> pair verbatim, <tt>highlight_lines_config</tt> pulls <tt>highlight_lines_class</tt> into the per-line class value, and <tt>write_highlighted</tt> interpolates that value directly into the <tt>class</tt> attribute of the per-line <tt><div></tt>. A single-quoted shell token preserves an inner double quote through shlex parsing, so a value such as <tt>'"><script>alert(1)</script>'</tt> terminates the <tt>class</tt> attribute early and the markup that follows is emitted as live HTML.</p><p>An attacker who can submit Markdown (through comments, posts, wiki pages, documentation, or any user-generated content) can inject arbitrary HTML and JavaScript that runs in the browser of every user who views the rendered output, enabling session theft, account takeover, and other client-side attacks. No authentication or special privileges are required.</p><p>The vulnerable native code originally shipped inside <tt>mdex</tt> (in <tt>native/comrak_nif/src/lumis_adapter.rs</tt>) and was later extracted into the separate <tt>mdex_native</tt> package (<tt>native/mdex_native_nif/src/lumis_adapter.rs</tt>), where it remains unpatched.</p><p>This issue affects mdex from 0.11.3 before 0.12.3, and mdex_native from 0.1.0 before 0.2.3.</p>"
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}
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],
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"value": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in leandrocp MDEx allows stored or reflected cross-site scripting via attacker-controlled Markdown.\n\nWhen syntax highlighting and full info-string forwarding (render: [full_info_string: true]) are enabled, the Lumis adapter copies the value of a code fence's highlight_lines_class info-string attribute, unescaped, into the class attribute of every rendered line. comrak_nif::lumis_adapter::LumisAdapter::parse_custom_attributes in native/comrak_nif/src/lumis_adapter.rs shlex-parses the info string and stores each key=value pair verbatim, highlight_lines_config pulls highlight_lines_class into the per-line class value, and write_highlighted interpolates that value directly into the class attribute of the per-line <div>. A single-quoted shell token preserves an inner double quote through shlex parsing, so a value such as '\"><script>alert(1)</script>' terminates the class attribute early and the markup that follows is emitted as live HTML.\n\nAn attacker who can submit Markdown (through comments, posts, wiki pages, documentation, or any user-generated content) can inject arbitrary HTML and JavaScript that runs in the browser of every user who views the rendered output, enabling session theft, account takeover, and other client-side attacks. No authentication or special privileges are required.\n\nThe vulnerable native code originally shipped inside mdex (in native/comrak_nif/src/lumis_adapter.rs) and was later extracted into the separate mdex_native package (native/mdex_native_nif/src/lumis_adapter.rs), where it remains unpatched.\n\nThis issue affects mdex from 0.11.3 before 0.12.3, and mdex_native from 0.1.0 before 0.2.3."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-63",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-63 Cross-Site Scripting (XSS)"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV4_0": {
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"attackComplexity": "LOW",
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"attackRequirements": "PRESENT",
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"attackVector": "NETWORK",
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"baseScore": 2.3,
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"baseSeverity": "LOW",
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"privilegesRequired": "NONE",
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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "LOW",
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"subIntegrityImpact": "LOW",
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"userInteraction": "PASSIVE",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
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"version": "4.0",
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"vulnAvailabilityImpact": "NONE",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE"
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},
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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]
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-79",
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"description": "CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
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"lang": "en",
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"type": "CWE"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"shortName": "EEF",
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"dateUpdated": "2026-06-30T04:37:51.902Z"
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},
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"references": [
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{
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"tags": [
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"vendor-advisory",
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"related"
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],
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"url": "https://github.com/leandrocp/mdex_native/security/advisories/GHSA-v664-pmxr-mxxx"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://cna.erlef.org/cves/CVE-2026-53427.html"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://osv.dev/vulnerability/EEF-CVE-2026-53427"
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},
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{
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"tags": [
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"patch"
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],
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"url": "https://github.com/leandrocp/mdex_native/commit/798a363b4339f6f7162ec8437c4c9f9b5ae6fbf3"
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}
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],
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"source": {
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"discovery": "EXTERNAL"
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},
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"title": "Cross-site scripting in MDEx via unescaped highlight_lines_class code-fence attribute",
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"workarounds": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>Do not enable full info-string forwarding (<tt>render: [full_info_string: true]</tt>) when rendering untrusted Markdown, which prevents the <tt>highlight_lines_class</tt> attribute from reaching the highlighter. Alternatively, restrict <tt>highlight_lines_class</tt> values to a safe character set (for example <tt>[A-Za-z0-9_- ]</tt>) before rendering.</p>"
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}
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],
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"value": "Do not enable full info-string forwarding (render: [full_info_string: true]) when rendering untrusted Markdown, which prevents the highlight_lines_class attribute from reaching the highlighter. Alternatively, restrict highlight_lines_class values to a safe character set (for example [A-Za-z0-9_- ]) before rendering."
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}
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],
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"x_generator": {
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"engine": "cvelib 1.8.0"
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}
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},
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"adp": [
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{
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"metrics": [
|
|
{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-06-29T19:18:13.166991Z",
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"id": "CVE-2026-53427",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-06-29T19:19:28.028Z"
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}
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}
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]
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}
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} |