jelmer dulwich up to 1.2.4 path traversal

Summaryinfo

A vulnerability identified as critical has been detected in jelmer dulwich up to 1.2.4. This affects an unknown part. The manipulation leads to path traversal. This vulnerability is referenced as CVE-2026-52726. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in jelmer dulwich up to 1.2.4. It has been rated as critical. This issue affects some unknown functionality. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is integrity, and availability. The summary by CVE is:

Dulwich is a pure-Python implementation of the Git file formats and protocols. Starting in version 0.23.2 and prior to version 1.2.5, `dulwich.porcelain.submodule_update`, and by extension `porcelain.clone(..., recurse_submodules=True)`, materializes attacker-controlled submodule paths from a crafted upstream repository without path validation. A malicious `.gitmodules` plus a matching tree gitlink whose `path` is `.git/hooks` (or any other directory inside the parent repository's `.git` directory) causes the attacker's submodule tree contents to be written directly into the victim's `.git/hooks/` directory, preserving executable mode bits. The dropped executables are then run by any subsequent `git` or `dulwich` command that invokes the matching hook, resulting in arbitrary code execution. This is the dulwich equivalent of the upstream Git fixes for CVE-2024-32002 / CVE-2024-32004, which were never propagated into dulwich's separately implemented submodule porcelain. Version 1.2.5 patches the issue.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-52726 since 06/08/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 320684 (Linux Distros Unpatched Vulnerability : CVE-2026-52726), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.2.5 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the databases at Tenable (320684) and EUVD (EUVD-2026-36195). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• jelmer

Name

• dulwich

Version

• 1.2.0
• 1.2.1
• 1.2.2
• 1.2.3
• 1.2.4

Website

• Product: https://github.com/jelmer/dulwich/

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