Bug#1140479: libheif: CVE-2026-49271

Source: libheif
Version: 1.21.2-4
Severity: important
Tags: security upstream
X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>

Hi,

The following vulnerability was published for libheif.

CVE-2026-49271[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-49271
    https://www.cve.org/CVERecord?id=CVE-2026-49271
[1] https://github.com/strukturag/libheif/security/advisories/GHSA-r7qj-cg5r-r6vf

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore