CVE-2026-49271
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk10th percentile — higher than 10% of all known CVEs
Summary
Prior to version 1.22.1 of the libheif library, the uncompressed HEIF decoder incorrectly validated 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.
Risk Assessment
An attacker can provide a specially crafted HEIF file that, when processed by an application using libheif, causes an out-of-bounds heap read and program crash, potentially enabling denial of service.
Recommendation
Immediately update the libheif library to version 1.22.1 or later, which includes a fix for the integer overflow vulnerability.
Original NVD description (English source)
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.