CVE-2026-32740: 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…

PriorityP351high8.8CVSS 3.1

AVNACLPRNUIRSUCHIHAH

EPSS

0.51%

40.3th percentile

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.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
struktur	libheif	< 1.22.0	1.22.0
strukturag	libheif	< 1.22.0	1.22.0
ubuntu	libheif	—	—

CVSS provenance

nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

vendor_redhat8.8HIGH

vendor_ubuntu6.5MEDIUM

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