{"id":"CVE-2026-47178","summary":"libheif has Heap Out Of Bounds Write in unci subsystem","details":"libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.19.0 through 1.21.2, a crafted HEIF file (uncompressed `unci` codec, tiled, component-interleaved, 4:2:0) triggers a heap out-of-bounds write in libheif's uncompressed tile decoder. The write overwrites the C++ vtable pointer of an adjacent `unc_decoder_component_interleave` object; the next virtual call dispatches to an attacker-chosen address. Version 1.22.0 patches the issue.","aliases":["GHSA-5x55-x5pf-9c6g"],"modified":"2026-08-12T16:25:21.233200Z","published":"2026-07-21T21:09:10.999Z","related":["SUSE-SU-2026:22153-1","SUSE-SU-2026:2622-1","openSUSE-SU-2026:10878-1","openSUSE-SU-2026:20974-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-787"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47178.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47178.json"},{"type":"ADVISORY","url":"https://github.com/strukturag/libheif/security/advisories/GHSA-5x55-x5pf-9c6g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47178"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/strukturag/libheif","events":[{"introduced":"c4e4657dcf6bcc06e934632f97736f7c78dbff9e"},{"fixed":"0c81a846b7401dbdb7118afd0761057f21e43511"}],"database_specific":{"cpe":"cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"1.19.0"},{"fixed":"1.22.0"}],"source":["AFFECTED_FIELD","CPE_RANGE"]}}],"versions":["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-2026-47178.json","vanir_signatures_modified":"2026-08-12T16:25:21Z","vanir_signatures":[{"digest":{"line_hashes":["175107675317900759648359576881034358256","220432159010798240840908416937024023837","268268967745545109707798594937166387611","253707932335489477155115861206639265538","199679408075604976163979654915891773303","175107675317900759648359576881034358256","220432159010798240840908416937024023837","268268967745545109707798594937166387611","286778284410146987248233194002847271266","178248309108630471590778685235254536836"],"threshold":0.9},"id":"CVE-2026-47178-91619f1d","signature_type":"Line","signature_version":"v1","source":"https://github.com/strukturag/libheif/commit/0c81a846b7401dbdb7118afd0761057f21e43511","target":{"file":"tests/uncompressed_box.cc"},"deprecated":false}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H"}]}