{"id":"CVE-2026-76957","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-76957","summary":null,"details":"libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.","published":"2026-08-20T04:28:04.788Z","modified":"2026-09-10T03:48:25.758955831Z","cvss":{"score":4.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/libexpat/libexpat/pull/1322","label":"libexpat/libexpat#1322"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76957.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76957"},{"type":"FIX","url":"https://github.com/libexpat/libexpat/pull/1322"},{"type":"FIX","url":"https://github.com/libexpat/libexpat/pull/1329"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-10T03:48:25.758955831Z"}}