{"id":"CVE-2026-55999","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-55999","summary":"xorg-server / xwayland glamor font atlas Heap Buffer Overflow","details":"Local attackers with a X connection able to provide PCX fonts to the X \nserver xorg-server before 21.2.24 and xwayland before 24.1.13 could \ncause a heap buffer overflow via SetFont due to missing glyph boundary checks.","published":"2026-07-08T08:07:11.088Z","modified":"2026-08-13T11:56:57.066855815Z","cvss":{"score":8.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55999.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55999"},{"type":"ADVISORY","url":"https://www.openwall.com/lists/oss-security/2026/07/08/2"},{"type":"FIX","url":"https://gitlab.freedesktop.org/xorg/xserver/-/commit/fbf7bac22e2c6bd627fb042742a23318263edae1"},{"type":"PACKAGE","url":"https://gitlab.freedesktop.org/xorg/xserver/"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-13T11:56:57.066855815Z"}}