{"id":"UBUNTU-CVE-2026-62377","details":"libheif is a HEIF and AVIF file format decoder and encoder. In 1.23.0 and earlier, a crafted HEIF sequence accepted by heif_context_read_from_memory() can leave the context with no registered sequence tracks and crash when heif_context_get_track(ctx, 0) is called. HeifContext::get_track() in libheif/context.cc executes assert(has_sequence()) before its normal error handling, so assert-enabled builds abort instead of allowing the public wrapper in libheif/api/libheif/heif_sequences.cc to return null. In release builds, removing the assertion lets the track_id zero path dereference m_tracks.begin()-\u003esecond on an empty map, which is undefined behavior and typically crashes. The issue is reachable through documented public APIs after parsing attacker-controlled bytes. This issue is fixed in version 1.23.1.","modified":"2026-09-18T23:45:03.221227500Z","published":"2026-08-18T22:17:00Z","related":["USN-8774-1"],"upstream":["CVE-2026-62377"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-62377"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-62377"},{"type":"REPORT","url":"https://github.com/strukturag/libheif/commit/e1a0bc1c1ae74f8075eaca30a1cdb2b9bee698d3"},{"type":"REPORT","url":"https://github.com/strukturag/libheif/issues/1844"},{"type":"REPORT","url":"https://github.com/strukturag/libheif/releases/tag/v1.23.1"},{"type":"REPORT","url":"https://github.com/strukturag/libheif/security/advisories/GHSA-9ww4-9v47-m7pj"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8774-1"}],"affected":[{"package":{"name":"libheif","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libheif?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.21.2-3ubuntu0.5"}]}],"versions":["1.20.2-1","1.20.2-2","1.20.2-2build1","1.20.2-2build2","1.20.2-2ubuntu1","1.21.2-1","1.21.2-3","1.21.2-3ubuntu0.1","1.21.2-3ubuntu0.2","1.21.2-3ubuntu0.3","1.21.2-3ubuntu0.4"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"heif-gdk-pixbuf","binary_version":"1.21.2-3ubuntu0.5"},{"binary_version":"1.21.2-3ubuntu0.5","binary_name":"heif-thumbnailer"},{"binary_version":"1.21.2-3ubuntu0.5","binary_name":"heif-view"},{"binary_version":"1.21.2-3ubuntu0.5","binary_name":"libheif-examples"},{"binary_name":"libheif-plugin-aomdec","binary_version":"1.21.2-3ubuntu0.5"},{"binary_name":"libheif-plugin-aomenc","binary_version":"1.21.2-3ubuntu0.5"},{"binary_name":"libheif-plugin-dav1d","binary_version":"1.21.2-3ubuntu0.5"},{"binary_version":"1.21.2-3ubuntu0.5","binary_name":"libheif-plugin-ffmpegdec"},{"binary_version":"1.21.2-3ubuntu0.5","binary_name":"libheif-plugin-j2kdec"},{"binary_name":"libheif-plugin-j2kenc","binary_version":"1.21.2-3ubuntu0.5"},{"binary_version":"1.21.2-3ubuntu0.5","binary_name":"libheif-plugin-jpegdec"},{"binary_version":"1.21.2-3ubuntu0.5","binary_name":"libheif-plugin-jpegenc"},{"binary_name":"libheif-plugin-kvazaar","binary_version":"1.21.2-3ubuntu0.5"},{"binary_name":"libheif-plugin-libde265","binary_version":"1.21.2-3ubuntu0.5"},{"binary_name":"libheif-plugin-rav1e","binary_version":"1.21.2-3ubuntu0.5"},{"binary_name":"libheif-plugin-svtenc","binary_version":"1.21.2-3ubuntu0.5"},{"binary_name":"libheif-plugin-x265","binary_version":"1.21.2-3ubuntu0.5"},{"binary_name":"libheif-plugins-all","binary_version":"1.21.2-3ubuntu0.5"},{"binary_version":"1.21.2-3ubuntu0.5","binary_name":"libheif1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-62377.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]}