{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-124317", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-11-07T12:27:50.865Z", "datePublished": "2026-11-07T14:17:57.180Z", "dateUpdated": "2026-11-07T14:17:57.180Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-11-07T14:17:57.180Z"}, "datePublic": "2026-11-06T00:00:00.000Z", "title": "libexpat through 2.10.0 Out-of-Bounds Read via unknown_toUtf8 and unknown_toUtf16", "descriptions": [{"lang": "en", "value": "libexpat through 2.10.0 contains an out-of-bounds read vulnerability in unknown_toUtf8() and unknown_toUtf16() in xmltok.c when handling application-registered unknown encodings. Attackers can supply a document ending in a truncated multibyte sequence so the convert callback reads past the parse buffer, leaking adjacent memory or crashing applications."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Buffer Over-read", "cweId": "CWE-126", "type": "CWE"}]}], "affected": [{"vendor": "libexpat", "product": "libexpat", "packageURL": "pkg:github/libexpat/libexpat", "defaultStatus": "unaffected", "versions": [{"version": "0", "lessThanOrEqual": "2.10.0", "status": "affected", "versionType": "semver"}], "repo": "https://github.com/libexpat/libexpat"}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*", "versionEndIncluding": "2.10.0"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 6.3, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "LOW", "baseScore": 4.8, "baseSeverity": "MEDIUM"}}], "references": [{"url": "https://github.com/libexpat/libexpat/pull/1492", "tags": ["patch", "issue-tracking"]}, {"url": "https://github.com/libexpat/libexpat/blob/a70841d9ffa64ddde29ab824ed6305035ebe4c47/expat/lib/xmltok.c#L1274-L1322", "tags": ["technical-description"]}, {"url": "https://github.com/libexpat/libexpat", "tags": ["product"]}, {"name": "VulnCheck Advisory: libexpat through 2.10.0 Out-of-Bounds Read via unknown_toUtf8 and unknown_toUtf16", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/libexpat-through-2.10.0-out-of-bounds-read-via-unknown-toutf8-and-unknown-toutf16"}], "credits": [{"lang": "en", "value": "O\u011fuzhan Demirba\u015f", "type": "finder"}, {"lang": "en", "value": "Sebastian Pipping", "type": "remediation developer"}], "x_generator": {"engine": "vulncheck-endgame"}}}}