{"id":"DEBIAN-CVE-2026-76957","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.","modified":"2026-09-09T09:00:32.087495102Z","published":"2026-08-20T05:16:29.747Z","upstream":["CVE-2026-76957"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-76957"}],"affected":[{"package":{"name":"expat","ecosystem":"Debian:12","purl":"pkg:deb/debian/expat?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.5.0-1+deb12u3"}]}],"versions":["2.5.0-1","2.5.0-1+deb12u1","2.5.0-1+deb12u2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-76957.json"}},{"package":{"name":"expat","ecosystem":"Debian:13","purl":"pkg:deb/debian/expat?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.1-2","2.7.2-1","2.7.3-1","2.7.3-2","2.7.4-1","2.7.5-1","2.8.0-1","2.8.0-2","2.8.1-1","2.8.2-1","2.8.2-1~deb13u1","2.8.3-1","2.8.3-1~deb13u1","2.8.4-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-76957.json"}},{"package":{"name":"expat","ecosystem":"Debian:14","purl":"pkg:deb/debian/expat?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.8.4-1"}]}],"versions":["2.7.1-2","2.7.2-1","2.7.3-1","2.7.3-2","2.7.4-1","2.7.5-1","2.8.0-1","2.8.0-2","2.8.1-1","2.8.2-1","2.8.2-1~deb13u1","2.8.3-1","2.8.3-1~deb13u1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-76957.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}