{"id":"UBUNTU-CVE-2026-50142","details":"libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.0, a crafted HEIF sequence accepted by heif_context_read_from_memory() with the msf1 sequence brand can cause unbounded heap allocation. In libheif/sequences/seq_boxes.cc, Box_stsz::parse() applies max_sequence_frames only to variable-size samples, so fixed-size mode accepts an attacker-controlled sample_count without a bound. In libheif/sequences/track.cc, Track::load() also adds current_sample_idx and samples_per_chunk in 32-bit arithmetic, allowing the consistency check to be bypassed by wraparound. The resulting values reach the Chunk::Chunk() allocation path, which can consume gigabytes of memory and crash or stall the process through memory exhaustion. This issue is fixed in version 1.23.0.","modified":"2026-09-02T19:40:47.195952535Z","published":"2026-07-02T00:00:00Z","related":["USN-8526-1"],"upstream":["CVE-2026-50142"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-50142"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-50142"},{"type":"REPORT","url":"https://github.com/strukturag/libheif/security/advisories/GHSA-jvmp-j3cw-84mh"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8526-1"}],"affected":[{"package":{"name":"libheif","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/libheif?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.2-1ubuntu0.6"}]}],"versions":["1.19.7-1","1.19.8-1","1.20.2-1","1.20.2-1ubuntu0.1","1.20.2-1ubuntu0.3","1.20.2-1ubuntu0.4","1.20.2-1ubuntu0.5"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1.20.2-1ubuntu0.6","binary_name":"heif-gdk-pixbuf"},{"binary_version":"1.20.2-1ubuntu0.6","binary_name":"heif-thumbnailer"},{"binary_name":"heif-view","binary_version":"1.20.2-1ubuntu0.6"},{"binary_name":"libheif-examples","binary_version":"1.20.2-1ubuntu0.6"},{"binary_version":"1.20.2-1ubuntu0.6","binary_name":"libheif-plugin-aomdec"},{"binary_version":"1.20.2-1ubuntu0.6","binary_name":"libheif-plugin-aomenc"},{"binary_name":"libheif-plugin-dav1d","binary_version":"1.20.2-1ubuntu0.6"},{"binary_version":"1.20.2-1ubuntu0.6","binary_name":"libheif-plugin-ffmpegdec"},{"binary_version":"1.20.2-1ubuntu0.6","binary_name":"libheif-plugin-j2kdec"},{"binary_name":"libheif-plugin-j2kenc","binary_version":"1.20.2-1ubuntu0.6"},{"binary_version":"1.20.2-1ubuntu0.6","binary_name":"libheif-plugin-jpegdec"},{"binary_name":"libheif-plugin-jpegenc","binary_version":"1.20.2-1ubuntu0.6"},{"binary_name":"libheif-plugin-kvazaar","binary_version":"1.20.2-1ubuntu0.6"},{"binary_version":"1.20.2-1ubuntu0.6","binary_name":"libheif-plugin-libde265"},{"binary_name":"libheif-plugin-rav1e","binary_version":"1.20.2-1ubuntu0.6"},{"binary_name":"libheif-plugin-svtenc","binary_version":"1.20.2-1ubuntu0.6"},{"binary_version":"1.20.2-1ubuntu0.6","binary_name":"libheif-plugin-x265"},{"binary_name":"libheif-plugins-all","binary_version":"1.20.2-1ubuntu0.6"},{"binary_name":"libheif1","binary_version":"1.20.2-1ubuntu0.6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50142.json"}},{"package":{"name":"libheif","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libheif?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.21.2-3ubuntu0.3"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_name":"heif-gdk-pixbuf","binary_version":"1.21.2-3ubuntu0.3"},{"binary_name":"heif-thumbnailer","binary_version":"1.21.2-3ubuntu0.3"},{"binary_name":"heif-view","binary_version":"1.21.2-3ubuntu0.3"},{"binary_name":"libheif-examples","binary_version":"1.21.2-3ubuntu0.3"},{"binary_version":"1.21.2-3ubuntu0.3","binary_name":"libheif-plugin-aomdec"},{"binary_name":"libheif-plugin-aomenc","binary_version":"1.21.2-3ubuntu0.3"},{"binary_name":"libheif-plugin-dav1d","binary_version":"1.21.2-3ubuntu0.3"},{"binary_name":"libheif-plugin-ffmpegdec","binary_version":"1.21.2-3ubuntu0.3"},{"binary_name":"libheif-plugin-j2kdec","binary_version":"1.21.2-3ubuntu0.3"},{"binary_name":"libheif-plugin-j2kenc","binary_version":"1.21.2-3ubuntu0.3"},{"binary_name":"libheif-plugin-jpegdec","binary_version":"1.21.2-3ubuntu0.3"},{"binary_version":"1.21.2-3ubuntu0.3","binary_name":"libheif-plugin-jpegenc"},{"binary_name":"libheif-plugin-kvazaar","binary_version":"1.21.2-3ubuntu0.3"},{"binary_name":"libheif-plugin-libde265","binary_version":"1.21.2-3ubuntu0.3"},{"binary_version":"1.21.2-3ubuntu0.3","binary_name":"libheif-plugin-rav1e"},{"binary_name":"libheif-plugin-svtenc","binary_version":"1.21.2-3ubuntu0.3"},{"binary_name":"libheif-plugin-x265","binary_version":"1.21.2-3ubuntu0.3"},{"binary_version":"1.21.2-3ubuntu0.3","binary_name":"libheif-plugins-all"},{"binary_name":"libheif1","binary_version":"1.21.2-3ubuntu0.3"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50142.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}