{"id":"CVE-2026-79591","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-79591","summary":"A heap-buffer-overflow and use-after-free vulnerability exists in the xls_getCSS() function of libxls 1.6.3 due to insufficient validation of a file-controlled font index.","details":"A heap-buffer-overflow and use-after-free vulnerability exists in the xls_getCSS() function of libxls 1.6.3 due to insufficient validation of a file-controlled font index.","published":"2026-09-10T21:17:46.933","modified":"2026-09-15T15:17:22.207","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/libxls/libxls/pull/164/changes/902c8f9b13710c3a13b6232fb86626c5c729402c","label":"libxls/libxls#164"},"references":[{"type":"WEB","url":"https://github.com/libxls/libxls/issues/161"},{"type":"WEB","url":"https://github.com/libxls/libxls/pull/164/changes/902c8f9b13710c3a13b6232fb86626c5c729402c"},{"type":"WEB","url":"https://github.com/libxls/libxls/issues/161"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-15T15:17:22.207"}}