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CVE-2026-53587

7.5 · HIGH

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-20EPSS 0.47%

Overview

CVE-2026-53587 is a high-severity vulnerability. It was published on August 20, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. 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, libgit2 performs a fixed-size strncmp in set_data in src/libgit2/transports/smart_pkt.c without first verifying that the smart-protocol pkt-line capability buffer contains 14 bytes. A malicious Git server can make bytes after the pkt-line complete object-format=, causing format_str to advance beyond the pkt-line and the following memchr length calculation to underflow. The resulting heap out-of-bounds walk can crash a client during the first refs-advertisement packet over HTTP, HTTPS, SSH, or the Git protocol. 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/2c0ce8c0132ac38ab0db28239462a671e2e5440eGitHubgithub.com/libgit2/libgit2/commit/affda60c10fcef16723451c0d7dc71b71dc20ad3GitHubgithub.com/libgit2/libgit2/commit/d7a9fb87f504434e9f45228678953c4fa56e7640GitHubgithub.com/libgit2/libgit2/releases/tag/v1.8.6GitHubgithub.com/libgit2/libgit2/releases/tag/v1.9.5GitHubgithub.com/libgit2/libgit2/security/advisories/GHSA-pm24-4jhq-3xvmGitHubgithub.com/libgit2/libgit2/security/advisories/GHSA-pm24-4jhq-3xvm

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53587?

CVE-2026-53587 is a high-severity vulnerability. It was published on August 20, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-53587?

This vulnerability has a CVSS 3.1 base score of 7.5, 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-2026-53587?

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-2026-53587?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53587 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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