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CVE-2026-53585

5.3 · MEDIUM

libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application.

Published Aug 20, 2026CWE-770EPSS 0.40%

Overview

CVE-2026-53585 is a medium-severity vulnerability. It was published on August 20, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, git_delta_apply in src/libgit2/delta.c trusts the attacker-controlled res_sz value parsed by hdr_sz from a delta object header and passes that amount to git__malloc before validating delta instructions. Malicious pack data supplied through git_clone, git_fetch, git_remote_fetch, git_indexer_append, or a local attacker-supplied repository can use a very small multi-level OFS_DELTA chain to retain extremely large allocations and exhaust memory. This issue is fixed in versions 1.8.6 and 1.9.5.

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/libgit2/libgit2/commit/0cdfdd5fa8f8514c82413025e1e0808866cf7c30GitHubgithub.com/libgit2/libgit2/commit/c1896f06df22cc0ca5658df3a8f6cd7ede4cd6aeGitHubgithub.com/libgit2/libgit2/commit/dec22ac01ad9620c96b7b9ac3ef636ea46d43bedGitHubgithub.com/libgit2/libgit2/releases/tag/v1.8.6GitHubgithub.com/libgit2/libgit2/releases/tag/v1.9.5GitHubgithub.com/libgit2/libgit2/security/advisories/GHSA-27m5-gxxh-x79jGitHubgithub.com/libgit2/libgit2/security/advisories/GHSA-27m5-gxxh-x79j

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53585?

CVE-2026-53585 is a medium-severity vulnerability. It was published on August 20, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-53585?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-53585?

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-2026-53585?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53585 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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