CVE-2026-32740

Description

libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and prior contain a heap-buffer-overflow (write) vulnerability in the grid tile compositing, allowing an attacker to write 64 bytes of fully attacker-controlled data past the end of a chroma plane heap allocation by crafting a HEIF/AVIF file with a 1×4 grid of odd-height tiles. The overflow is triggered during normal image decoding with default build configuration. The written bytes are chroma (Cb/Cr) pixel values from the attacking tile, giving the attacker full control over the overflow content. This issue has been fixed in version 1.22.0.

CVSS Vector

Affected Products

References

• https://github.com/strukturag/libheif/releases/tag/v1.22.0
• https://github.com/strukturag/libheif/security/advisories/GHSA-frfr-f3vg-2g6j
• https://github.com/strukturag/libheif/security/advisories/GHSA-frfr-f3vg-2g6j