HEIF and AVIF Decoder Vulnerability in libheif by Struktur AG
CVE-2026-47709

6.9MEDIUM

Key Information:

Vendor

Strukturag

Status
Libheif
Vendor
CVE Published:
21 July 2026

What is CVE-2026-47709?

The libheif library, which handles HEIF and AVIF file formats, presents a vulnerability that affects versions prior to 1.22.0. This issue arises when processing a malformed uncompressed HEIF image item that includes an 'uncC' property without a corresponding 'ispe' property. Consequently, this leads to a crash in the public C API function heif_image_handle_get_image_tiling(). Depending on the build configuration, this may trigger an assertion failure or result in a null pointer dereference, leading to potential application instability. Upgrading to version 1.22.0 mitigates 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/issues/1802
x_refsource_MISC
https://github.com/strukturag/libheif/pull/1806
x_refsource_MISC

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.