{"id":"CVE-2026-88806","title":"A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.","summary":"A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-122","CWE-787"],"vendor":"x.org","product":"libX11","affected":["libX11 < 1.8.14"],"published":"2026-09-21","updated":"2026-09-22","sourceUpdated":"2026-09-22T19:40:05.870","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-88806","references":[{"url":"https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/309","label":"meissner@suse.de"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88806.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-88806"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2538514"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-88806"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88806"},{"url":"https://access.redhat.com/errata/RHSA-2026:89730"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00202,"epssPercentile":0.09998,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-21T00:00:00+00:00"},"ingestedAt":"2026-09-21T14:38:56.363Z","patched":["enterprise_linux_appstream_v_8"],"slug":"CVE-2026-88806","body":"## Overview\n\nA malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:89730** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-10-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:89730)\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 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9 · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88806.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}