{"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":"2026-09-22","sourceUpdated":"2026-09-22T15:17:19.207","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"},{"url":"https://github.com/strukturag/libheif/security/advisories/GHSA-2c3g-p585-8rpq","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84449.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-84449"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-84449"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-22T14:52:03.728215Z"},"epss":0.00416,"epssPercentile":0.35747,"ingestedAt":"2026-09-18T16:45:41.395Z","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.\n\n## Vendor advisories\n\n- **Red Hat VEX** · updated 2026-09-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84449.json)","depth":"twilight","depthScore":32,"depthScoreParts":{"impact":20.4,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":209083,"id":"CVE-2026-84449","ts":1790089536290,"field":"exploit_available","old":"false","new":"true"}]}