{"id":"CVE-2026-32738","summary":"libheif has a Heap OOB Read/SEGV Crash via Zero samples_per_chunk","details":"libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and below, a crafted 792-byte HEIF sequence file with samples_per_chunk=0 in the stsc box causes an unsigned integer underflow in the Chunk constructor (m_last_sample = 0 + 0 - 1 = UINT32_MAX), mapping all samples to an empty chunk and resulting in a denial of service. When any sample is accessed, the library reads from index 0 of an empty std::vector, causing a guaranteed SEGV (null-page read). The file parses successfully without producing an error; the crash occurs on the first frame access. This issue has been fixed in version 1.22.0.","aliases":["GHSA-7f2h-cmpf-v9ww"],"modified":"2026-07-15T19:00:07.540173Z","published":"2026-05-19T19:03:48.553Z","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-125","CWE-476"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32738.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32738.json"},{"type":"ADVISORY","url":"https://github.com/strukturag/libheif/security/advisories/GHSA-7f2h-cmpf-v9ww"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32738"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/strukturag/libheif","events":[{"introduced":"0"},{"fixed":"0c81a846b7401dbdb7118afd0761057f21e43511"}],"database_specific":{"cpe":"cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"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","v1.18.0","v1.18.0-rc1","v1.17.6","v1.17.5","v1.17.4","v1.17.3","v1.17.2","v1.17.1","v1.17.0","v1.16.2","v1.16.1","v1.16.0","v1.15.2","v1.15.1","v1.15.0","v1.14.2","v1.14.1","v1.14.0","v1.13.0","v1.12.0","v1.11.0","v1.10.0","v1.9.1","v1.9.0","v1.8.0","v1.7.0","v1.3.2","v1.3.1","v1.3.0","v1.2.0","v1.1.0"],"database_specific":{"vanir_signatures_modified":"2026-07-15T19:00:07Z","vanir_signatures":[{"signature_version":"v1","source":"https://github.com/strukturag/libheif/commit/0c81a846b7401dbdb7118afd0761057f21e43511","target":{"file":"tests/uncompressed_box.cc"},"deprecated":false,"digest":{"line_hashes":["175107675317900759648359576881034358256","220432159010798240840908416937024023837","268268967745545109707798594937166387611","253707932335489477155115861206639265538","199679408075604976163979654915891773303","175107675317900759648359576881034358256","220432159010798240840908416937024023837","268268967745545109707798594937166387611","286778284410146987248233194002847271266","178248309108630471590778685235254536836"],"threshold":0.9},"id":"CVE-2026-32738-91619f1d","signature_type":"Line"}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-32738.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}