HEIF and AVIF Decoder Vulnerability in libheif by Struktur AG
CVE-2026-84450

4.3MEDIUM

Key Information:

Vendor

Strukturag

Status
Libheif
Vendor
CVE Published:
18 September 2026

What is CVE-2026-84450?

This vulnerability in libheif affects versions 1.19.0 through 1.23.3 and allows attackers to manipulate crafted images containing specific properties that bypass normal security limits. Such malformed images can lead to invalid crop calculations through the tiling API. This exploitation highlights severe implications for image processing operations, particularly in systems relying on secure image handling. The issue is mitigated in version 1.23.3, which addresses the flawed handling of image dimensions.

Affected Version(s)

libheif >= 1.19.0, < 1.23.3

References

https://github.com/strukturag/libheif/security/advisories...
x_refsource_CONFIRM
https://github.com/strukturag/libheif/commit/1c2df9c0e814...
x_refsource_MISC
https://github.com/strukturag/libheif/releases/tag/v1.23.3
x_refsource_MISC

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.