{"id":"CVE-2026-84446","published":"2026-09-18T16:17:12.513","lastModified":"2026-09-21T21:17:13.683","description":"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.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-835"],"vendors":[],"products":[],"references":[{"url":"https://github.com/strukturag/libheif/commit/3a7a69ae325f652e48c026b8241ab25bedf44d9b","tags":[]},{"url":"https://github.com/strukturag/libheif/releases/tag/v1.23.2","tags":[]},{"url":"https://github.com/strukturag/libheif/security/advisories/GHSA-xw34-mjcp-jqh8","tags":[]}],"exploitRefs":[{"url":"https://github.com/strukturag/libheif/commit/3a7a69ae325f652e48c026b8241ab25bedf44d9b","tags":[]},{"url":"https://github.com/strukturag/libheif/releases/tag/v1.23.2","tags":[]},{"url":"https://github.com/strukturag/libheif/security/advisories/GHSA-xw34-mjcp-jqh8","tags":[]}],"hasPoc":true,"ai":null}