{"id":"CVE-2026-124317","aliases":["AZL-112841","AZL-113119","AZL-113248","DEBIAN-CVE-2026-124317","EUVD-2026-119271","GHSA-wm22-jw4m-rfcf","UBUNTU-CVE-2026-124317"],"status":"published","title":"libexpat through 2.10.0 Out-of-Bounds Read via unknown_toUtf8 and unknown_toUtf16","description":"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.","severity":{"version":"4.0","score":6.3,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00249,"percentile":0.16318,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-126"],"published":"2026-11-07T14:17:57Z","modified":"2026-11-11T14:17:32Z","affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"expat","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.9.0-1"}]}]},{"source":"osv","ecosystem":"Azure Linux:3","package":"cmake","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.30.3-15"}]}]},{"source":"osv","ecosystem":"Azure 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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.","status":"published","published":"2026-11-07T15:17:16.08Z","modified":"2026-11-11T05:19:36.56Z","cvss":[{"version":"4.0","score":6.3,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-126"],"updated_at":"2026-11-11T07:23:50.496882Z"}],"osv":[{"id":"CVE-2026-124317","title":"libexpat through 2.10.0 Out-of-Bounds Read via unknown_toUtf8 and unknown_toUtf16","description":"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.","status":"published","published":"2026-11-07T14:17:57.18Z","modified":"2026-11-09T02:47:17.929938077Z","cvss":[{"version":"4.0","score":6.3,"vector":"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","level":"medium"}],"cwes":["CWE-126"],"updated_at":"2026-11-09T03:16:17.543303Z"},{"id":"DEBIAN-CVE-2026-124317","description":"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.","status":"published","published":"2026-11-07T15:17:16.08Z","modified":"2026-11-11T10:00:56.507666678Z","cvss":[{"version":"4.0","score":6.3,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"}],"updated_at":"2026-11-11T10:35:16.464644Z"},{"id":"UBUNTU-CVE-2026-124317","description":"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.","status":"published","published":"2026-11-09T00:00:00Z","modified":"2026-11-10T02:50:22.405923697Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L","level":"medium"},{"version":"4.0","score":6.3,"vector":"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","level":"medium"}],"updated_at":"2026-11-10T03:18:58.105788Z"},{"id":"AZL-112841","title":"CVE-2026-124317 affecting package expat 2.9.0-1","description":"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.","status":"published","published":"2026-11-07T15:17:16Z","modified":"2026-11-08T14:16:24.709892346Z","updated_at":"2026-11-08T14:36:14.146733Z"},{"id":"AZL-113119","title":"CVE-2026-124317 affecting package cmake 3.30.3-15","description":"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.","status":"published","published":"2026-11-07T15:17:16Z","modified":"2026-11-11T14:17:31.873717169Z","updated_at":"2026-11-11T14:42:54.020399Z"},{"id":"AZL-113248","title":"CVE-2026-124317 affecting package python3 3.12.16-1","description":"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.","status":"published","published":"2026-11-07T15:17:16Z","modified":"2026-11-11T14:17:32.799024672Z","updated_at":"2026-11-11T14:42:54.020399Z"}]}}