{"id":"CVE-2025-68431","title":"libheif is an HEIF and AVIF file format decoder and encoder","summary":"libheif is an HEIF and AVIF file format decoder and encoder. Prior to version 1.21.0, a crafted HEIF that exercises the overlay image item path triggers a heap buffer over-read in `HeifPixelImage::overlay()`. The function computes a nega…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cwe":["CWE-125","CWE-190"],"vendor":"struktur","product":"libheif","affected":["libheif < 1.21.0"],"patched":["libheif 1.21.0"],"published":"2025-12-29","updated":"2026-10-07","sourceUpdated":"2026-10-07T12:10:00.170","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-68431","references":[{"url":"https://github.com/strukturag/libheif/commit/b8c12a7b70f46c9516711a988483bed377b78d46","label":"security-advisories@github.com"},{"url":"https://github.com/strukturag/libheif/releases/tag/v1.21.0","label":"security-advisories@github.com"},{"url":"https://github.com/strukturag/libheif/security/advisories/GHSA-j87x-4gmq-cqfq","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00427,"epssPercentile":0.34826,"ingestedAt":"2026-10-07T12:29:01.341Z","slug":"CVE-2025-68431","body":"## Overview\n\nlibheif is an HEIF and AVIF file format decoder and encoder. Prior to version 1.21.0, a crafted HEIF that exercises the overlay image item path triggers a heap buffer over-read in `HeifPixelImage::overlay()`. The function computes a negative row length (likely from an unclipped overlay rectangle or invalid offsets), which then underflows when converted to `size_t` and is passed to `memcpy`, causing a very large read past the end of the source plane and a crash. Version 1.21.0 contains a patch. As a workaround, avoid decoding images using `iovl` overlay boxes.\n\n## Affected\n\n- `libheif < 1.21.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `libheif 1.21.0`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}