{"id":"UBUNTU-CVE-2026-84446","details":"libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.23.2, crafted HEIF sequence timing and edit-list data can make Track::init_sample_timing_table() compute a logical m_num_output_samples value that exceeds the uint32_t counters used by Track_Visual::decode_next_image_sample() and Track::get_next_sample_raw_data(). The resulting comparison can never reach the oversized output count, causing non-terminating decode or raw-sample loops and bypassing max_sequence_frames. The same sequence path repeatedly calls Box_stts::get_sample_duration() and allocates Chunk::m_sample_ranges and Track::m_presentation_timeline outside MemoryHandle accounting, allowing severe CPU and memory exhaustion from a small file. This issue is fixed in version 1.23.2.","modified":"2026-10-02T00:30:07.739184500Z","published":"2026-09-18T16:17:00Z","related":["USN-8846-1"],"upstream":["CVE-2026-84446"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-84446"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-84446"},{"type":"REPORT","url":"https://github.com/strukturag/libheif/security/advisories/GHSA-xw34-mjcp-jqh8"},{"type":"REPORT","url":"https://github.com/strukturag/libheif/commit/3a7a69ae325f652e48c026b8241ab25bedf44d9b"},{"type":"REPORT","url":"https://github.com/strukturag/libheif/releases/tag/v1.23.2"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8846-1"}],"affected":[{"package":{"name":"libheif","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libheif?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.21.2-3ubuntu0.6"}]}],"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","1.21.2-3ubuntu0.5"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1.21.2-3ubuntu0.6","binary_name":"heif-gdk-pixbuf"},{"binary_name":"heif-thumbnailer","binary_version":"1.21.2-3ubuntu0.6"},{"binary_name":"heif-view","binary_version":"1.21.2-3ubuntu0.6"},{"binary_name":"libheif-examples","binary_version":"1.21.2-3ubuntu0.6"},{"binary_name":"libheif-plugin-aomdec","binary_version":"1.21.2-3ubuntu0.6"},{"binary_name":"libheif-plugin-aomenc","binary_version":"1.21.2-3ubuntu0.6"},{"binary_name":"libheif-plugin-dav1d","binary_version":"1.21.2-3ubuntu0.6"},{"binary_name":"libheif-plugin-ffmpegdec","binary_version":"1.21.2-3ubuntu0.6"},{"binary_name":"libheif-plugin-j2kdec","binary_version":"1.21.2-3ubuntu0.6"},{"binary_name":"libheif-plugin-j2kenc","binary_version":"1.21.2-3ubuntu0.6"},{"binary_name":"libheif-plugin-jpegdec","binary_version":"1.21.2-3ubuntu0.6"},{"binary_version":"1.21.2-3ubuntu0.6","binary_name":"libheif-plugin-jpegenc"},{"binary_name":"libheif-plugin-kvazaar","binary_version":"1.21.2-3ubuntu0.6"},{"binary_version":"1.21.2-3ubuntu0.6","binary_name":"libheif-plugin-libde265"},{"binary_name":"libheif-plugin-rav1e","binary_version":"1.21.2-3ubuntu0.6"},{"binary_name":"libheif-plugin-svtenc","binary_version":"1.21.2-3ubuntu0.6"},{"binary_name":"libheif-plugin-x265","binary_version":"1.21.2-3ubuntu0.6"},{"binary_version":"1.21.2-3ubuntu0.6","binary_name":"libheif-plugins-all"},{"binary_name":"libheif1","binary_version":"1.21.2-3ubuntu0.6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84446.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}