libgit2 up to 1.8.5/1.9.4 Submodule src/libgit2/submodule.c git_submodule_lookup/git_submodule_add_setup path traversal

Summaryinfo

A vulnerability marked as problematic has been reported in libgit2 up to 1.8.5/1.9.4. Affected by this issue is the function git_submodule_lookup/git_submodule_add_setup of the file src/libgit2/submodule.c of the component Submodule. The manipulation leads to path traversal. This vulnerability is referenced as CVE-2026-53584. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in libgit2 up to 1.8.5/1.9.4 and classified as problematic. This issue affects the function git_submodule_lookup/git_submodule_add_setup of the file src/libgit2/submodule.c of the component Submodule. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-23. The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory. Impacted is integrity. The summary by CVE is:

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 does not reject traversal components in a submodule path loaded from .gitmodules. The affected src/libgit2/submodule.c paths include git_submodule_lookup and git_submodule_add_setup. A crafted repository can specify a path such as ../escape-target, and applications that initialize the submodule can create directories outside the repository working tree. This issue is fixed in versions 1.8.6 and 1.9.5.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-53584 since 06/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 1.8.6 or 1.9.5 eliminates this vulnerability.

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Productinfo

Name

• libgit2

Version

• 1.8.0
• 1.8.1
• 1.8.2
• 1.8.3
• 1.8.4
• 1.8.5
• 1.9.0
• 1.9.1
• 1.9.2
• 1.9.3
• 1.9.4

Website

• Product: https://github.com/libgit2/libgit2/

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