237 lines
11 KiB
JSON
237 lines
11 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-2026-80431",
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"assignerOrgId": "4daa8cea-433a-44bd-9456-53b127fc289a",
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"state": "PUBLISHED",
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"assignerShortName": "Secur0",
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"dateReserved": "2026-08-26T10:49:01.410Z",
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"datePublished": "2026-09-25T13:23:51.590Z",
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"dateUpdated": "2026-09-25T15:07:45.536Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "4daa8cea-433a-44bd-9456-53b127fc289a",
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"shortName": "Secur0",
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"dateUpdated": "2026-09-25T13:23:51.590Z"
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},
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"title": "Out-of-bounds write in the kitty text sizing protocol allows termination of the terminal process",
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"datePublic": "2026-09-21T04:01:00.000Z",
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"cweId": "CWE-787",
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"description": "CWE-787 Out-of-bounds Write",
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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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"impacts": [
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{
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"capecId": "CAPEC-100",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-100 Overflow Buffers"
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}
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]
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}
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],
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"affected": [
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{
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"vendor": "Kovid Goyal",
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"product": "kitty",
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"repo": "https://github.com/kovidgoyal/kitty",
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"programFiles": [
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"kitty/screen.c"
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],
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"versions": [
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{
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"status": "affected",
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"version": "0.40.0",
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"lessThan": "0.49.0",
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"versionType": "semver"
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}
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],
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"defaultStatus": "unaffected"
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}
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],
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"cpeApplicability": [
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{
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"operator": "OR",
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:a:kovidgoyal:kitty:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "0.40.0",
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"versionEndExcluding": "0.49.0"
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}
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]
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}
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]
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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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"value": "Out-of-bounds Write in the natural width branch of the text sizing protocol in kitty from 0.40.0 before 0.49.0 allows a program writing to the terminal to write past the end of a fixed-size buffer, because screen_handle_multicell_command() in kitty/screen.c appends each codepoint of a grapheme cluster with lc.chars[lc.count++] = ch without any capacity check, while lc is declared by the RAII_ListOfChars macro as a four-element char_type array in the function's stack frame, so an OSC 66 escape code whose payload carries a grapheme cluster longer than four codepoints writes beyond that buffer, one 32-bit value per additional codepoint, in the order the codepoints appear. Where the cluster is preceded in the same payload by a sequence that causes an intermediate flush, the buffer is first migrated to the heap by ensure_space_for_chars() and the write occurs past the heap allocation instead. This results in termination of the kitty process and therefore of all its windows, tabs and child processes.",
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"supportingMedia": [
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{
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"type": "text/html",
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"base64": false,
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"value": "Out-of-bounds Write in the natural width branch of the text sizing protocol in kitty from 0.40.0 before 0.49.0 allows a program writing to the terminal to write past the end of a fixed-size buffer, because <code>screen_handle_multicell_command()</code> in <code>kitty/screen.c</code> appends each codepoint of a grapheme cluster with <code>lc.chars[lc.count++] = ch</code> without any capacity check, while <code>lc</code> is declared by the <code>RAII_ListOfChars</code> macro as a four-element <code>char_type</code> array in the function's stack frame, so an OSC 66 escape code whose payload carries a grapheme cluster longer than four codepoints writes beyond that buffer, one 32-bit value per additional codepoint, in the order the codepoints appear. Where the cluster is preceded in the same payload by a sequence that causes an intermediate flush, the buffer is first migrated to the heap by <code>ensure_space_for_chars()</code> and the write occurs past the heap allocation instead. This results in termination of the kitty process and therefore of all its windows, tabs and child processes."
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}
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]
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}
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],
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"tags": [
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"x_open-source"
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],
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"references": [
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{
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"url": "https://github.com/kovidgoyal/kitty/commit/7d2fbaadcc2b1eeeef89bd875ec622b42362574b",
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"tags": [
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"patch"
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]
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},
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{
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"url": "https://github.com/kovidgoyal/kitty/releases/tag/v0.49.0",
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"tags": [
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"release-notes"
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]
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},
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{
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"url": "https://secur0.com/en/cna/cve-list/cve-2026-80431-kitty-text-sizing-out-of-bounds-write",
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"tags": [
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"third-party-advisory",
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"technical-description"
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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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"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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"cvssV4_0": {
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"attackVector": "LOCAL",
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"attackComplexity": "LOW",
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"attackRequirements": "NONE",
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"privilegesRequired": "NONE",
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"userInteraction": "PASSIVE",
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"vulnConfidentialityImpact": "NONE",
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"subConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"vulnAvailabilityImpact": "HIGH",
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"subAvailabilityImpact": "NONE",
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"exploitMaturity": "NOT_DEFINED",
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"Safety": "NOT_DEFINED",
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"Automatable": "NOT_DEFINED",
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"Recovery": "NOT_DEFINED",
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"valueDensity": "NOT_DEFINED",
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"vulnerabilityResponseEffort": "NOT_DEFINED",
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"providerUrgency": "NOT_DEFINED",
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"version": "4.0",
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"baseSeverity": "MEDIUM",
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"baseScore": 6.8,
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"vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
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}
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}
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],
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"solutions": [
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{
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"lang": "en",
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"value": "Upgrade to kitty 0.49.0 or later.",
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"supportingMedia": [
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{
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"type": "text/html",
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"base64": false,
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"value": "Upgrade to kitty 0.49.0 or later."
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}
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]
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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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"value": "C4sh3R",
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"type": "finder"
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},
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{
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"lang": "en",
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"value": "Cristian Fernández Cornejo",
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"type": "analyst"
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},
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{
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"lang": "en",
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"value": "Xoán M. Otero Jorge",
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"type": "analyst"
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},
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{
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"lang": "en",
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"value": "Secur0 CNA",
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"type": "coordinator"
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},
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{
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"lang": "en",
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"value": "Kovid Goyal",
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"type": "remediation developer"
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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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"x_generator": {
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"engine": "Vulnogram 1.0.5"
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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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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-09-25T15:05:06.462333Z",
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"id": "CVE-2026-80431",
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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": "2026-09-25T15:07:45.536Z"
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}
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}
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]
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}
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} |