{"id":"CVE-2026-56003","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-56003","summary":"libXfont2 computeProps Property Buffer Heap Buffer Overflow","details":"A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.","published":"2026-07-08T09:25:41.723Z","modified":"2026-08-12T16:41:28.061387Z","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":"WEB","url":"https://gitlab.freedesktop.org/xorg/lib/libxfont/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56003.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56003"},{"type":"ADVISORY","url":"https://www.openwall.com/lists/oss-security/2026/07/08/1"},{"type":"FIX","url":"https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/dff957a5158da038a282a59a31fe736702732939"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T16:41:28.061387Z"}}