{"id":"CVE-2026-84451","summary":"libheif: Incomplete fix for CVE-2026-62292 leaves libheif vulnerable to an out-of-bounds read","details":"libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.3, the no-icef full-item branch of unc_decoder::get_compressed_image_data_uncompressed() in libheif/codecs/uncompressed/unc_decoder.cc retains an addition-based range check that can wrap when a crafted uncompressed tile grid produces a large range_start_offset and range_size. The overflow makes the bounds comparison pass and allows heif_image_handle_decode_image_tile() to call memcpy() with an invalid source pointer and a very large length when decoding a valid high-index advertised tile. This incomplete remediation of CVE-2026-62292 can reliably crash tile-processing applications, while whole-image decoding is not claimed to reach the demonstrated path. This issue is fixed in version 1.23.3.","aliases":["GHSA-hh47-fhqr-cj2r"],"modified":"2026-09-19T03:47:23.069592601Z","published":"2026-09-18T16:02:22.529Z","related":["openSUSE-SU-2026:11719-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84451.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-125"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84451.json"},{"type":"FIX","url":"https://github.com/strukturag/libheif/commit/8bfed9a9ed008e4ef28abc736284a90d3cba754f"},{"type":"WEB","url":"https://github.com/strukturag/libheif/releases/tag/v1.23.3"},{"type":"ADVISORY","url":"https://github.com/strukturag/libheif/security/advisories/GHSA-hh47-fhqr-cj2r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84451"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/strukturag/libheif","events":[{"introduced":"c4e4657dcf6bcc06e934632f97736f7c78dbff9e"},{"fixed":"78c9746aea226b22885e8d35241353ce669c4ea5"}],"database_specific":{"extracted_events":[{"introduced":"1.19.0"},{"fixed":"1.23.3"}],"source":"AFFECTED_FIELD"}}],"versions":["v1.23.2","v1.23.1","v1.23.0","v1.22.2","v1.22.1","v1.22.0","v1.21.2","v1.21.1","v1.21.0","v1.20.1","v1.20.0","v1.19.5","v1.19.4","v1.19.3","v1.19.2","v1.19.1","v1.19.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84451.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}