{"id":"CVE-2026-84449","title":"libheif is a HEIF and AVIF file format decoder and encoder","summary":"libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.19.6, Op_RGB24_32_to_YCbCr::convert_colorspace() stores image-plane strides in an integer width that can overflow for extremely large RGB images created through heif_…","severity":"low","cvss":3.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-125","CWE-190"],"vendor":"strukturag","product":"libheif","affected":["libheif < 1.19.6"],"published":"2026-09-18","updated":"2026-09-18","sourceUpdated":"2026-09-18T16:17:13.123","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84449","references":[{"url":"https://github.com/strukturag/libheif/commit/e29953da30eb11aa1762df0bff3b36be4b22fbe3","label":"security-advisories@github.com"},{"url":"https://github.com/strukturag/libheif/releases/tag/v1.19.6","label":"security-advisories@github.com"},{"url":"https://github.com/strukturag/libheif/security/advisories/GHSA-2c3g-p585-8rpq","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-18T16:45:41.395Z","epss":0.00339,"epssPercentile":0.27305,"slug":"CVE-2026-84449","body":"## Overview\n\nlibheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.19.6, Op_RGB24_32_to_YCbCr::convert_colorspace() stores image-plane strides in an integer width that can overflow for extremely large RGB images created through heif_image_create() and heif_image_add_plane(). The resulting wrapped stride causes the conversion loop in libheif/color-conversion/rgb2yuv.cc to compute an invalid input pointer and read beyond the allocated interleaved plane while heif_context_encode_image() performs RGB-to-YCbCr conversion. This can crash the encoding process. This issue is fixed in version 1.19.6.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":20,"depthScoreParts":{"impact":20.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}