Heap Buffer Overflow in libheif HEIF and AVIF File Format Decoder by Struktur AG
CVE-2026-32741

7.1HIGH

Key Information:

Vendor

Strukturag

Status
Libheif
Vendor
CVE Published:
19 May 2026

What is CVE-2026-32741?

The libheif library, responsible for decoding HEIF and AVIF file formats, is vulnerable to a heap buffer overflow. This vulnerability arises from a flaw in the MaskImageCodec::decode_mask_image() function, specifically when decoding a HEIF file containing a mask image. The function improperly copies the full extent of data into a pixel buffer using memcpy without verifying the size, allowing attackers to create crafted files that exceed buffer allocations, leading to potential exploit scenarios. Versions prior to 1.22.0 are affected, and users are advised to upgrade to mitigate this risk.

Affected Version(s)

libheif < 1.22.0

References

https://github.com/strukturag/libheif/security/advisories...
x_refsource_CONFIRM
https://github.com/strukturag/libheif/releases/tag/v1.22.0
x_refsource_MISC

CVSS V3.1

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.