{"id":"UBUNTU-CVE-2026-62291","details":"libheif is a HEIF and AVIF file format decoder and encoder. In 1.23.0 and earlier, a crafted image sequence with a 2x2 primary plane and a 256x256 auxiliary alpha plane can cause attacker-controlled heap corruption during a normal decode and re-encode workflow. Track_Visual::decode_next_image_sample() calls transfer_channel_from_image_as() without checking that the auxiliary alpha dimensions match the main frame. The resulting inconsistent image reaches heif_track_decode_next_image() and then heif_context_encode_image(). In unc_encoder::encode(), unc_encoder_component_interleave::encode_tile() sizes its buffer with compute_tile_data_size_bytes() using the primary dimensions but copies each component using its actual plane dimensions. The oversized alpha plane is therefore copied beyond the allocation, causing an out-of-bounds write; the inverse size mismatch can also produce an out-of-bounds read. This issue is fixed in version 1.23.1.","modified":"2026-09-18T23:56:34.212006382Z","published":"2026-08-20T00:00:00Z","related":["USN-8683-1","USN-8774-1"],"upstream":["CVE-2026-62291"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-62291"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-62291"},{"type":"REPORT","url":"https://github.com/strukturag/libheif/commit/ac5521ad50399885de96bb6a0733a5d2442740f9"},{"type":"REPORT","url":"https://github.com/strukturag/libheif/releases/tag/v1.23.1"},{"type":"REPORT","url":"https://github.com/strukturag/libheif/security/advisories/GHSA-xpw3-9rhw-482x"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8683-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8774-1"}],"affected":[{"package":{"name":"libheif","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libheif?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17.6-1ubuntu4.8"}]}],"versions":["1.16.2-2ubuntu1","1.17.1-1ubuntu2","1.17.1-1ubuntu3","1.17.4-1ubuntu1","1.17.6-1ubuntu1","1.17.6-1ubuntu2","1.17.6-1ubuntu3","1.17.6-1ubuntu4","1.17.6-1ubuntu4.1","1.17.6-1ubuntu4.2","1.17.6-1ubuntu4.3","1.17.6-1ubuntu4.4","1.17.6-1ubuntu4.5","1.17.6-1ubuntu4.6","1.17.6-1ubuntu4.7"],"ecosystem_specific":{"binaries":[{"binary_name":"heif-gdk-pixbuf","binary_version":"1.17.6-1ubuntu4.8"},{"binary_name":"heif-thumbnailer","binary_version":"1.17.6-1ubuntu4.8"},{"binary_name":"libheif-examples","binary_version":"1.17.6-1ubuntu4.8"},{"binary_version":"1.17.6-1ubuntu4.8","binary_name":"libheif-plugin-aomdec"},{"binary_version":"1.17.6-1ubuntu4.8","binary_name":"libheif-plugin-aomenc"},{"binary_version":"1.17.6-1ubuntu4.8","binary_name":"libheif-plugin-dav1d"},{"binary_name":"libheif-plugin-ffmpegdec","binary_version":"1.17.6-1ubuntu4.8"},{"binary_name":"libheif-plugin-j2kdec","binary_version":"1.17.6-1ubuntu4.8"},{"binary_version":"1.17.6-1ubuntu4.8","binary_name":"libheif-plugin-j2kenc"},{"binary_name":"libheif-plugin-jpegdec","binary_version":"1.17.6-1ubuntu4.8"},{"binary_name":"libheif-plugin-jpegenc","binary_version":"1.17.6-1ubuntu4.8"},{"binary_name":"libheif-plugin-libde265","binary_version":"1.17.6-1ubuntu4.8"},{"binary_name":"libheif-plugin-rav1e","binary_version":"1.17.6-1ubuntu4.8"},{"binary_name":"libheif-plugin-svtenc","binary_version":"1.17.6-1ubuntu4.8"},{"binary_name":"libheif-plugin-x265","binary_version":"1.17.6-1ubuntu4.8"},{"binary_name":"libheif1","binary_version":"1.17.6-1ubuntu4.8"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-62291.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":"1.21.2-3ubuntu0.5"}]}],"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","1.21.2-3ubuntu0.1","1.21.2-3ubuntu0.2","1.21.2-3ubuntu0.3","1.21.2-3ubuntu0.4"],"ecosystem_specific":{"binaries":[{"binary_version":"1.21.2-3ubuntu0.5","binary_name":"heif-gdk-pixbuf"},{"binary_name":"heif-thumbnailer","binary_version":"1.21.2-3ubuntu0.5"},{"binary_name":"heif-view","binary_version":"1.21.2-3ubuntu0.5"},{"binary_version":"1.21.2-3ubuntu0.5","binary_name":"libheif-examples"},{"binary_name":"libheif-plugin-aomdec","binary_version":"1.21.2-3ubuntu0.5"},{"binary_name":"libheif-plugin-aomenc","binary_version":"1.21.2-3ubuntu0.5"},{"binary_name":"libheif-plugin-dav1d","binary_version":"1.21.2-3ubuntu0.5"},{"binary_name":"libheif-plugin-ffmpegdec","binary_version":"1.21.2-3ubuntu0.5"},{"binary_name":"libheif-plugin-j2kdec","binary_version":"1.21.2-3ubuntu0.5"},{"binary_name":"libheif-plugin-j2kenc","binary_version":"1.21.2-3ubuntu0.5"},{"binary_version":"1.21.2-3ubuntu0.5","binary_name":"libheif-plugin-jpegdec"},{"binary_name":"libheif-plugin-jpegenc","binary_version":"1.21.2-3ubuntu0.5"},{"binary_name":"libheif-plugin-kvazaar","binary_version":"1.21.2-3ubuntu0.5"},{"binary_name":"libheif-plugin-libde265","binary_version":"1.21.2-3ubuntu0.5"},{"binary_version":"1.21.2-3ubuntu0.5","binary_name":"libheif-plugin-rav1e"},{"binary_version":"1.21.2-3ubuntu0.5","binary_name":"libheif-plugin-svtenc"},{"binary_name":"libheif-plugin-x265","binary_version":"1.21.2-3ubuntu0.5"},{"binary_version":"1.21.2-3ubuntu0.5","binary_name":"libheif-plugins-all"},{"binary_name":"libheif1","binary_version":"1.21.2-3ubuntu0.5"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-62291.json"}}],"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:L/A:L"},{"type":"Ubuntu","score":"medium"}]}