{"id":"DEBIAN-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":"2026-09-10T09:00:24.187468986Z","published":"2026-08-18T22:16:52.633Z","upstream":["CVE-2026-50142"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-50142"}],"affected":[{"package":{"name":"libheif","ecosystem":"Debian:12","purl":"pkg:deb/debian/libheif?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.15.1-1","1.15.1-1+deb12u1","1.16.2-1","1.16.2-2","1.16.2-3","1.17.0-1","1.17.1-1","1.17.4-1","1.17.6-1","1.17.6-2","1.17.6-3","1.17.6-4","1.18.1-1","1.18.1-2","1.18.2-1","1.18.2-2","1.19.1-1","1.19.1-1~bpo12+1","1.19.1-1~bpo12+2","1.19.3-1","1.19.3-1~bpo12+1","1.19.5-1","1.19.7-1","1.19.7-1~bpo12+1","1.19.8-1","1.20.1-1","1.20.2-1","1.20.2-2","1.21.2-1","1.21.2-2","1.21.2-3","1.21.2-4","1.23.1-1","1.23.2-1","1.23.3-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-50142.json"}},{"package":{"name":"libheif","ecosystem":"Debian:14","purl":"pkg:deb/debian/libheif?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.23.1-1"}]}],"versions":["1.19.8-1","1.20.1-1","1.20.2-1","1.20.2-2","1.21.2-1","1.21.2-2","1.21.2-3","1.21.2-4"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-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"}]}