{"id":"CVE-2026-84384","title":"libheif is a HEIF and AVIF file format decoder and encoder","summary":"libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.2, crafted HEIF or AVIF mime metadata and unci image data can cause decompress_brotli() and do_inflate() to grow accumulated output without an effective s…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-409"],"vendor":"strukturag","product":"libheif","affected":["libheif >= 1.19.0, < 1.23.2"],"published":"2026-09-18","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:16.907","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84384","references":[{"url":"https://github.com/strukturag/libheif/commit/21893e8f66c8b79363ca2809391b07d35e1a95ec","label":"security-advisories@github.com"},{"url":"https://github.com/strukturag/libheif/releases/tag/v1.23.2","label":"security-advisories@github.com"},{"url":"https://github.com/strukturag/libheif/security/advisories/GHSA-24wx-9w62-c96w","label":"security-advisories@github.com"},{"url":"https://github.com/strukturag/libheif/security/advisories/GHSA-24wx-9w62-c96w","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-18T17:30:24.859004Z"},"ingestedAt":"2026-09-18T16:45:41.393Z","epss":0.00524,"epssPercentile":0.43248,"slug":"CVE-2026-84384","body":"## Overview\n\nlibheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.2, crafted HEIF or AVIF mime metadata and unci image data can cause decompress_brotli() and do_inflate() to grow accumulated output without an effective size limit or MemoryHandle accounting. The brotli path has no output bound, while the zlib path checks only a small temporary buffer in a branch that valid streams do not reach, and overlapping icef units can decompress the same payload repeatedly. HeifContext::interpret_heif_file_images() processes multiple compressed metadata items during file opening, allowing a small file to consume unbounded memory and terminate the process. This issue is fixed in version 1.23.2.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":207066,"id":"CVE-2026-84384","ts":1789753654352,"field":"exploit_available","old":"false","new":"true"}]}