CVE-2026-47714

libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and prior, the inline mask parsing code in `libheif/region.cc` contains an integer overflow. Both `width` and `height` are `unsigned int` (32-bit) values parsed from the HEIF file. Their product can exceed `UINT32_MAX`, wrapping to a small value before the division by 8. This causes an undersized buffer allocation, leading to out-of-bounds memory access when the mask data is later interpreted as a `width x height` bitmap. Version 1.22.0 patches the issue.

Score

CVSS 3.1 6.1 Medium

Status

Analyzed - security-advisories@github.com

Published

2026-07-21

Last modified

2026-10-24

Weaknesses

CWE-190

Affected products

• Libheif (Struktur)
• Libheif (Strukturag)

References

• https://github.com/strukturag/libheif/security/advisories/GHSA-h4wm-6wwf-qvhx