{"apiVersion":"1.0","identifier":"CVE-2026-50142","description":"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.","publishedAt":"2026-08-18T22:16:52","lastModifiedAt":"2026-08-19T19:17:18","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-50142","cvssScore":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","epssProbability":0.00556,"riskScore":0.79,"affectedProduct":"libheif","affectedVersions":">=1.19.0,<1.23.0","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-50142","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-50142","en":"https://www.redsauce.net/en/cves/CVE-2026-50142","fr":"https://www.redsauce.net/fr/cves/CVE-2026-50142","pt":"https://www.redsauce.net/pt/cves/CVE-2026-50142","de":"https://www.redsauce.net/de/cves/CVE-2026-50142","sk":"https://www.redsauce.net/sk/cves/CVE-2026-50142","el":"https://www.redsauce.net/el/cves/CVE-2026-50142"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-50142"}}