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 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 v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/strukturag/libheif/releases/tag/v1.22.0	Release Notes
https://github.com/strukturag/libheif/security/advisories/GHSA-frfr-f3vg-2g6j	Exploit Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-32740
https://bugzilla.redhat.com/show_bug.cgi?id=2479969
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32740.json

Configurations

Configuration 1 (hide)

cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-19 20:16

Updated : 2026-07-24 09:10

NVD link : CVE-2026-32740

Mitre link : CVE-2026-32740

CVE.ORG link : CVE-2026-32740

JSON object : View

Products Affected

struktur

libheif

CWE

CWE-787

Out-of-bounds Write

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