288 lines
14 KiB
JSON
288 lines
14 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-2026-39804",
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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": "2026-04-07T12:28:54.916Z",
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"datePublished": "2026-05-01T20:34:24.604Z",
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"dateUpdated": "2026-05-27T15:41:26.362Z"
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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:mtrudel:bandit:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.Bandit.WebSocket.PerMessageDeflate'"
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],
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"packageName": "bandit",
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"packageURL": "pkg:hex/bandit",
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"product": "bandit",
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"programFiles": [
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"lib/bandit/websocket/permessage_deflate.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Bandit.WebSocket.PerMessageDeflate':inflate/2"
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}
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],
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"repo": "https://github.com/mtrudel/bandit",
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"vendor": "mtrudel",
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"versions": [
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{
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"lessThan": "1.11.0",
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"status": "affected",
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"version": "0.5.9",
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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:mtrudel:bandit:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.Bandit.WebSocket.PerMessageDeflate'"
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],
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"packageName": "mtrudel/bandit",
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"packageURL": "pkg:github/mtrudel/bandit",
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"product": "bandit",
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"programFiles": [
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"lib/bandit/websocket/permessage_deflate.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Bandit.WebSocket.PerMessageDeflate':inflate/2"
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}
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],
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"repo": "https://github.com/mtrudel/bandit",
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"vendor": "mtrudel",
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"versions": [
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{
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"lessThan": "8156921a51e684a951221da7bc30a70a022f722e",
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"status": "affected",
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"version": "da4027cff7d2b80319e76fe7a32f84beceec490a",
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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": "The vulnerability is only reachable when both of the following conditions are true:<ul><li>Bandit's server-level <tt>websocket_options.compress</tt> is enabled (it defaults to <tt>true</tt>).</li><li>The per-upgrade <tt>compress: true</tt> option is passed to <tt>WebSockAdapter.upgrade/4</tt> (it defaults to <tt>false</tt>; Phoenix's default is also <tt>false</tt>).</li></ul>Stock Phoenix and LiveView applications are not affected because <tt>compress: false</tt> is their default."
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}
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],
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"value": "The vulnerability is only reachable when both of the following conditions are true:\n- Bandit's server-level websocket_options.compress is enabled (it defaults to true).\n- The per-upgrade compress: true option is passed to WebSockAdapter.upgrade/4 (it defaults to false; Phoenix's default is also false).\n\nStock Phoenix and LiveView applications are not affected because compress: false is their default."
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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:mtrudel:bandit:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "1.11.0",
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"versionStartIncluding": "0.5.9",
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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": "OR"
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}
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],
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"operator": "AND"
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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": "Mat Trudel"
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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": "Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion when WebSocket permessage-deflate compression is enabled.<p><tt>'Elixir.Bandit.WebSocket.PerMessageDeflate':inflate/2</tt> in <tt>lib/bandit/websocket/permessage_deflate.ex</tt> calls <tt>:zlib.inflate/2</tt> with no output-size cap, then materializes the entire decompressed payload as a single binary via <tt>IO.iodata_to_binary/1</tt>. The <tt>websocket_options.max_frame_size</tt> option only bounds the on-the-wire (compressed) frame size, not the decompressed output. A high-ratio compressed frame (e.g. uniform data at ~1024:1 ratio) can stay well under any wire-size limit while forcing GiB-scale heap allocations in the connection process before any application code runs.</p><p>An unauthenticated attacker who can open a WebSocket connection can send a single such frame to exhaust the BEAM node's memory and trigger an OOM kill.</p><p>This vulnerability requires both Bandit's server-level <tt>websocket_options.compress</tt> and the per-upgrade <tt>compress: true</tt> option passed to <tt>WebSockAdapter.upgrade/4</tt> to be enabled. Stock Phoenix and LiveView applications are not affected as they default to <tt>compress: false</tt>.</p><p>This issue affects bandit: from 0.5.9 before 1.11.0.</p>"
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}
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],
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"value": "Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion when WebSocket permessage-deflate compression is enabled.\n\n'Elixir.Bandit.WebSocket.PerMessageDeflate':inflate/2 in lib/bandit/websocket/permessage_deflate.ex calls :zlib.inflate/2 with no output-size cap, then materializes the entire decompressed payload as a single binary via IO.iodata_to_binary/1. The websocket_options.max_frame_size option only bounds the on-the-wire (compressed) frame size, not the decompressed output. A high-ratio compressed frame (e.g. uniform data at ~1024:1 ratio) can stay well under any wire-size limit while forcing GiB-scale heap allocations in the connection process before any application code runs.\n\nAn unauthenticated attacker who can open a WebSocket connection can send a single such frame to exhaust the BEAM node's memory and trigger an OOM kill.\n\nThis vulnerability requires both Bandit's server-level websocket_options.compress and the per-upgrade compress: true option passed to WebSockAdapter.upgrade/4 to be enabled. Stock Phoenix and LiveView applications are not affected as they default to compress: false.\n\nThis issue affects bandit: from 0.5.9 before 1.11.0."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-130",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-130 Excessive Allocation"
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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": 8.2,
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"baseSeverity": "HIGH",
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"privilegesRequired": "NONE",
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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"userInteraction": "NONE",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
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"version": "4.0",
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"vulnAvailabilityImpact": "HIGH",
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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-770",
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"description": "CWE-770 Allocation of Resources Without Limits or Throttling",
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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": "2026-05-27T15:41:26.362Z"
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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/mtrudel/bandit/security/advisories/GHSA-frh3-6pv6-rc8j"
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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-2026-39804.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-2026-39804"
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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/mtrudel/bandit/commit/8156921a51e684a951221da7bc30a70a022f722e"
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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": "WebSocket permessage-deflate inflate has no output-size cap in bandit",
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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": "Do not pass <tt>compress: true</tt> to <tt>WebSockAdapter.upgrade/4</tt>. Omitting this option (or setting it to <tt>false</tt>) prevents permessage-deflate from being negotiated, so the inflate path is never reached."
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}
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],
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"value": "Do not pass compress: true to WebSockAdapter.upgrade/4. Omitting this option (or setting it to false) prevents permessage-deflate from being negotiated, so the inflate path is never reached."
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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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"references": [
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{
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"url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-frh3-6pv6-rc8j",
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"tags": [
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"exploit"
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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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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-05-02T01:19:00.687361Z",
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"id": "CVE-2026-39804",
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"options": [
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{
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"Exploitation": "poc"
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},
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{
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"Automatable": "yes"
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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": "2026-05-02T01:19:55.677Z"
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}
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}
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]
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}
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} |