Vulnerability Details CVE-2026-49271
libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.1, the uncompressed HEIF decoder validates explicit icef compressed-unit offsets using unit_offset + unit_size. Because the addition can wrap, a crafted HEIF file can pass the range check and then construct a vector from iterators outside the compressed item buffer, producing an out-of-bounds heap read and crash. Version 1.22.1 patches the issue.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 9.8%
CVSS Severity
CVSS v3 Score 6.5