Out-of-bounds write in libheif - CVE-2026-32740
Published: May 20, 2026
Vulnerability identifier: #VU131977
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-32740
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: struktur AG
Affected software:
libheif
libheif
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to out-of-bounds write in HeifPixelImage::copy_image_to() when decoding a crafted grid-based HEIF or AVIF image. A remote attacker can supply a specially crafted file to execute arbitrary code.
User interaction is required to open or decode a crafted file. Exploitation requires grid images using YCbCr 4:2:0 chroma subsampling with odd-height tiles.
How to mitigate CVE-2026-32740
Install security update from vendor's website.