{"id":"UBUNTU-CVE-2026-32738","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.","modified":"2026-06-18T22:00:19.042447687Z","published":"2026-05-19T19:16:00Z","related":["USN-8454-1"],"upstream":["CVE-2026-32738"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-32738"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-32738"},{"type":"REPORT","url":"https://github.com/strukturag/libheif/security/advisories/GHSA-7f2h-cmpf-v9ww"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8454-1"}],"affected":[{"package":{"name":"libheif","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/libheif?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.2-1ubuntu0.4"}]}],"versions":["1.19.7-1","1.19.8-1","1.20.2-1","1.20.2-1ubuntu0.1","1.20.2-1ubuntu0.3"],"ecosystem_specific":{"binaries":[{"binary_name":"heif-gdk-pixbuf","binary_version":"1.20.2-1ubuntu0.4"},{"binary_version":"1.20.2-1ubuntu0.4","binary_name":"heif-thumbnailer"},{"binary_name":"heif-view","binary_version":"1.20.2-1ubuntu0.4"},{"binary_version":"1.20.2-1ubuntu0.4","binary_name":"libheif-examples"},{"binary_name":"libheif-plugin-aomdec","binary_version":"1.20.2-1ubuntu0.4"},{"binary_name":"libheif-plugin-aomenc","binary_version":"1.20.2-1ubuntu0.4"},{"binary_name":"libheif-plugin-dav1d","binary_version":"1.20.2-1ubuntu0.4"},{"binary_name":"libheif-plugin-ffmpegdec","binary_version":"1.20.2-1ubuntu0.4"},{"binary_name":"libheif-plugin-j2kdec","binary_version":"1.20.2-1ubuntu0.4"},{"binary_version":"1.20.2-1ubuntu0.4","binary_name":"libheif-plugin-j2kenc"},{"binary_version":"1.20.2-1ubuntu0.4","binary_name":"libheif-plugin-jpegdec"},{"binary_version":"1.20.2-1ubuntu0.4","binary_name":"libheif-plugin-jpegenc"},{"binary_version":"1.20.2-1ubuntu0.4","binary_name":"libheif-plugin-kvazaar"},{"binary_name":"libheif-plugin-libde265","binary_version":"1.20.2-1ubuntu0.4"},{"binary_version":"1.20.2-1ubuntu0.4","binary_name":"libheif-plugin-rav1e"},{"binary_name":"libheif-plugin-svtenc","binary_version":"1.20.2-1ubuntu0.4"},{"binary_version":"1.20.2-1ubuntu0.4","binary_name":"libheif-plugin-x265"},{"binary_name":"libheif-plugins-all","binary_version":"1.20.2-1ubuntu0.4"},{"binary_version":"1.20.2-1ubuntu0.4","binary_name":"libheif1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32738.json"}},{"package":{"name":"libheif","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libheif?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.21.2-3ubuntu0.1"}]}],"versions":["1.20.2-1","1.20.2-2","1.20.2-2build1","1.20.2-2build2","1.20.2-2ubuntu1","1.21.2-1","1.21.2-3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1.21.2-3ubuntu0.1","binary_name":"heif-gdk-pixbuf"},{"binary_name":"heif-thumbnailer","binary_version":"1.21.2-3ubuntu0.1"},{"binary_version":"1.21.2-3ubuntu0.1","binary_name":"heif-view"},{"binary_name":"libheif-examples","binary_version":"1.21.2-3ubuntu0.1"},{"binary_name":"libheif-plugin-aomdec","binary_version":"1.21.2-3ubuntu0.1"},{"binary_name":"libheif-plugin-aomenc","binary_version":"1.21.2-3ubuntu0.1"},{"binary_name":"libheif-plugin-dav1d","binary_version":"1.21.2-3ubuntu0.1"},{"binary_name":"libheif-plugin-ffmpegdec","binary_version":"1.21.2-3ubuntu0.1"},{"binary_version":"1.21.2-3ubuntu0.1","binary_name":"libheif-plugin-j2kdec"},{"binary_version":"1.21.2-3ubuntu0.1","binary_name":"libheif-plugin-j2kenc"},{"binary_name":"libheif-plugin-jpegdec","binary_version":"1.21.2-3ubuntu0.1"},{"binary_name":"libheif-plugin-jpegenc","binary_version":"1.21.2-3ubuntu0.1"},{"binary_name":"libheif-plugin-kvazaar","binary_version":"1.21.2-3ubuntu0.1"},{"binary_version":"1.21.2-3ubuntu0.1","binary_name":"libheif-plugin-libde265"},{"binary_name":"libheif-plugin-rav1e","binary_version":"1.21.2-3ubuntu0.1"},{"binary_name":"libheif-plugin-svtenc","binary_version":"1.21.2-3ubuntu0.1"},{"binary_name":"libheif-plugin-x265","binary_version":"1.21.2-3ubuntu0.1"},{"binary_version":"1.21.2-3ubuntu0.1","binary_name":"libheif-plugins-all"},{"binary_version":"1.21.2-3ubuntu0.1","binary_name":"libheif1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-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"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}