{"id":"CVE-2026-120208","title":"libheif 1.18.0 before 1.23.3 Heap Buffer Overflow via unci Mixed-Interleave Decoder","summary":"libheif 1.18.0 before 1.23.3 contains a heap-based buffer overflow vulnerability in unc_decoder_mixed_interleave::processTile() that allows attackers to write out of bounds by supplying chroma components with unequal bit depths. Attacker…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-122"],"vendor":"strukturag","product":"libheif","affected":["libheif >= 1.18.0 < 1.23.3"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-11-02T17:09:44.328658Z"},"published":"2026-10-31","updated":"2026-11-02","sourceUpdated":"2026-11-02T17:45:27.671Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-120208","references":[{"url":"https://github.com/strukturag/libheif/security/advisories/GHSA-x8r2-mggj-j6wr","label":"GitHub Security Advisory (GHSA-x8r2-mggj-j6wr)"},{"url":"https://github.com/strukturag/libheif/commit/9d3cd91d7b1c8c68deef6d06057ab956bcb0dfb9"},{"url":"https://github.com/strukturag/libheif/releases/tag/v1.23.3","label":"libheif v1.23.3 Release Notes"},{"url":"https://github.com/strukturag/libheif/blob/v1.23.2/libheif/codecs/uncompressed/unc_decoder_mixed_interleave.cc#L95"},{"url":"https://www.vulncheck.com/advisories/libheif-1.18.0-before-1.23.3-heap-buffer-overflow-via-unci-mixed-interleave-decoder","label":"VulnCheck Advisory: libheif 1.18.0 before 1.23.3 Heap Buffer Overflow via unci Mixed-Interleave Decoder"}],"tags":["cve.org"],"epss":0.00365,"epssPercentile":0.3052,"ingestedAt":"2026-11-05T19:30:42.749Z","slug":"CVE-2026-120208","body":"## Overview\n\nlibheif 1.18.0 before 1.23.3 contains a heap-based buffer overflow vulnerability in unc_decoder_mixed_interleave::processTile() that allows attackers to write out of bounds by supplying chroma components with unequal bit depths. Attackers can craft a HEIF file declaring, for example, 16-bit Cb and 8-bit Cr to trigger file-controlled heap writes past the Cr plane, potentially achieving code execution in image-processing pipelines.\n\n## Affected\n\n- `libheif >= 1.18.0 < 1.23.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}