VULNERABILITY INTELLIGENCE

CVE-2026-32740

CVSS score8.8 HIGH
EPSS probability0.68%
CISA KEVNot currently listed
Published2026-05-19
Last modified2026-07-24
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

Weakness classification

  • security-advisories@github.com: CWE-787
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-787

Primary references