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CVE-2026-84444

7.4 · HIGH

libheif is a HEIF and AVIF file format decoder and encoder.

Published Sep 18, 2026CWE-787EPSS 0.48%

Overview

CVE-2026-84444 is a high-severity vulnerability. It was published on September 18, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.23.2, when WITH_UNCOMPRESSED_CODEC is enabled, heif_context_add_image_tile() accepts an independently constructed tile whose component-plane dimensions do not match the tile geometry established by the prototype image. ImageItem_uncompressed::add_image_tile() passes that tile directly to unc_encoder::encode_tile(), which lacked the check_component_sizes() gate and sizes its output from the configured tile geometry while copying the tile's actual component-plane dimensions. An oversized component plane can therefore make unc_encoder_component_interleave::encode_tile() copy attacker-controlled data beyond the heap output buffer. This issue is fixed in version 1.23.2.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/strukturag/libheif/commit/e65071f59a1ac08aa1eb0d07a831deaf6bb4d03bGitHubgithub.com/strukturag/libheif/releases/tag/v1.23.2GitHubgithub.com/strukturag/libheif/security/advisories/GHSA-j264-xvrp-5v7qGitHubgithub.com/strukturag/libheif/security/advisories/GHSA-j264-xvrp-5v7q

How CyberStrike helps

Frequently asked questions

What is CVE-2026-84444?

CVE-2026-84444 is a high-severity vulnerability. It was published on September 18, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2026-84444?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-84444?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-84444?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-84444 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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