{"id":"CVE-2026-86140","title":"In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.","summary":"In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.","severity":"high","cvss":8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","cwe":["CWE-121","CWE-120"],"vendor":"xmlsoft","product":"libxml2","affected":["libxml2 < 2.15.4"],"patched":["libxml2 2.15.4"],"published":"2026-09-05","updated":"2026-09-15","sourceUpdated":"2026-09-15T19:39:17.010","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86140","references":[{"url":"https://github.com/GNOME/libxml2/commit/d1686f91dbda141a752200419d35639fd6b38340","label":"cve@mitre.org"},{"url":"https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4","label":"cve@mitre.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-86140.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-86140"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2528989"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-86140"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86140"},{"url":"https://access.redhat.com/errata/RHSA-2026:64463"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00149,"epssPercentile":0.04455,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-08T18:06:03.098551Z"},"scores":{"nvd":8,"vendor":7.4,"cna":8},"ingestedAt":"2026-09-06T02:48:38.731Z","slug":"CVE-2026-86140","body":"## Overview\n\nIn libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.\n\n## Affected\n\n- `libxml2 < 2.15.4`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `libxml2 2.15.4`\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-86140.json)\n- **RHSA-2026:64463** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:64463)","depth":"twilight","depthScore":44,"depthScoreParts":{"impact":44,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}