{"id":"UBUNTU-CVE-2026-32741","details":"libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and below contain a heap buffer overflow in MaskImageCodec::decode_mask_image(). When decoding a HEIF file containing a mask image (mski), the function copies the full iloc extent data into a pixel buffer using memcpy(dst, data.data(), data.size()). The copy length data.size() is determined by the iloc extent in the file (attacker-controlled), while the destination buffer is sized based on the declared image dimensions. Because no upper-bound check exists on the data length, a crafted file whose iloc extent exceeds the pixel buffer allocation overflows the heap. The vulnerable single-memcpy branch is reached when the mskC property specifies bits_per_pixel = 8 and the ispe property declares an even width ≥ 64 (so that stride == width), with no changes to default security limits or external codec plugins required. This issue has been fixed in version 1.22.0.","modified":"2026-06-30T18:16:14.742793252Z","published":"2026-05-19T21:16:00Z","related":["USN-8454-1"],"upstream":["CVE-2026-32741"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-32741"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-32741"},{"type":"REPORT","url":"https://github.com/strukturag/libheif/releases/tag/v1.22.0"},{"type":"REPORT","url":"https://github.com/strukturag/libheif/security/advisories/GHSA-j3w5-7whq-p37q"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8454-1"}],"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":"1.17.6-1ubuntu4.4"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_name":"heif-gdk-pixbuf","binary_version":"1.17.6-1ubuntu4.4"},{"binary_name":"heif-thumbnailer","binary_version":"1.17.6-1ubuntu4.4"},{"binary_name":"libheif-examples","binary_version":"1.17.6-1ubuntu4.4"},{"binary_version":"1.17.6-1ubuntu4.4","binary_name":"libheif-plugin-aomdec"},{"binary_name":"libheif-plugin-aomenc","binary_version":"1.17.6-1ubuntu4.4"},{"binary_version":"1.17.6-1ubuntu4.4","binary_name":"libheif-plugin-dav1d"},{"binary_name":"libheif-plugin-ffmpegdec","binary_version":"1.17.6-1ubuntu4.4"},{"binary_version":"1.17.6-1ubuntu4.4","binary_name":"libheif-plugin-j2kdec"},{"binary_name":"libheif-plugin-j2kenc","binary_version":"1.17.6-1ubuntu4.4"},{"binary_name":"libheif-plugin-jpegdec","binary_version":"1.17.6-1ubuntu4.4"},{"binary_version":"1.17.6-1ubuntu4.4","binary_name":"libheif-plugin-jpegenc"},{"binary_name":"libheif-plugin-libde265","binary_version":"1.17.6-1ubuntu4.4"},{"binary_name":"libheif-plugin-rav1e","binary_version":"1.17.6-1ubuntu4.4"},{"binary_version":"1.17.6-1ubuntu4.4","binary_name":"libheif-plugin-svtenc"},{"binary_name":"libheif-plugin-x265","binary_version":"1.17.6-1ubuntu4.4"},{"binary_version":"1.17.6-1ubuntu4.4","binary_name":"libheif1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32741.json"}},{"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_version":"1.20.2-1ubuntu0.4","binary_name":"heif-view"},{"binary_version":"1.20.2-1ubuntu0.4","binary_name":"libheif-examples"},{"binary_name":"libheif-plugin-aomdec","binary_version":"1.20.2-1ubuntu0.4"},{"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_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_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_version":"1.20.2-1ubuntu0.4"},{"binary_name":"libheif-plugin-libde265","binary_version":"1.20.2-1ubuntu0.4"},{"binary_name":"libheif-plugin-rav1e","binary_version":"1.20.2-1ubuntu0.4"},{"binary_name":"libheif-plugin-svtenc","binary_version":"1.20.2-1ubuntu0.4"},{"binary_name":"libheif-plugin-x265","binary_version":"1.20.2-1ubuntu0.4"},{"binary_version":"1.20.2-1ubuntu0.4","binary_name":"libheif-plugins-all"},{"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-2026-32741.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":{"binaries":[{"binary_version":"1.21.2-3ubuntu0.1","binary_name":"heif-gdk-pixbuf"},{"binary_version":"1.21.2-3ubuntu0.1","binary_name":"heif-thumbnailer"},{"binary_name":"heif-view","binary_version":"1.21.2-3ubuntu0.1"},{"binary_version":"1.21.2-3ubuntu0.1","binary_name":"libheif-examples"},{"binary_name":"libheif-plugin-aomdec","binary_version":"1.21.2-3ubuntu0.1"},{"binary_version":"1.21.2-3ubuntu0.1","binary_name":"libheif-plugin-aomenc"},{"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_name":"libheif-plugin-j2kenc","binary_version":"1.21.2-3ubuntu0.1"},{"binary_version":"1.21.2-3ubuntu0.1","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_name":"libheif-plugin-libde265","binary_version":"1.21.2-3ubuntu0.1"},{"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_name":"libheif-plugins-all","binary_version":"1.21.2-3ubuntu0.1"},{"binary_name":"libheif1","binary_version":"1.21.2-3ubuntu0.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32741.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:L/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H"},{"type":"Ubuntu","score":"medium"}]}