{"id":"CVE-2026-86138","title":"In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.","summary":"In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.","severity":"medium","cvss":6.9,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","cwe":["CWE-190","CWE-787"],"vendor":"xmlsoft","product":"libxml2","affected":["libxml2 < 2.15.4"],"patched":["libxml2 2.15.4"],"published":"2026-09-05","updated":"2026-09-15","sourceUpdated":"2026-09-15T19:40:47.560","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86138","references":[{"url":"https://github.com/GNOME/libxml2/commit/a4cba4b5b5a8c42e155ed42d2d2a44955465a2e4","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-2026-86138.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-86138"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2528986"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-86138"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86138"},{"url":"https://access.redhat.com/errata/RHSA-2026:64463"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00125,"epssPercentile":0.02535,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-08T18:04:19.094572Z"},"ingestedAt":"2026-09-06T02:48:38.449Z","slug":"CVE-2026-86138","body":"## Overview\n\nIn libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-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** · Moderate · 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 7, Red Hat Enterprise Linux 8, Red Hat OpenShift Container Platform 4, … · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-86138.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":"sunlit","depthScore":38,"depthScoreParts":{"impact":38,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}