{"id":"CVE-2026-84446","title":"libheif is a HEIF and AVIF file format decoder and encoder","summary":"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_…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-835"],"vendor":"strukturag","product":"libheif","affected":["libheif < 1.23.2"],"published":"2026-09-18","updated":"2026-09-21","sourceUpdated":"2026-09-21T21:17:13.683","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84446","references":[{"url":"https://github.com/strukturag/libheif/commit/3a7a69ae325f652e48c026b8241ab25bedf44d9b","label":"security-advisories@github.com"},{"url":"https://github.com/strukturag/libheif/releases/tag/v1.23.2","label":"security-advisories@github.com"},{"url":"https://github.com/strukturag/libheif/security/advisories/GHSA-xw34-mjcp-jqh8","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-18T20:13:16.634765Z"},"epss":0.00464,"epssPercentile":0.39449,"ingestedAt":"2026-09-18T16:45:41.394Z","slug":"CVE-2026-84446","body":"## Overview\n\nlibheif 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}