CVE-2026-52726: high-severity vulnerability in jelmer dulwich
Dulwich's submodule path traversal in porcelain.submodule_update / porcelain.clone(recurse_submodules=True) yields RCE via attacker-dropped .git/hooks payload
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.4%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
jelmer · dulwichRelated CVEs — jelmer dulwich
In the same product, most dangerous first.
CVE-2026-114094HIGHDulwich before 1.2.9 Arbitrary File Write via DOS drive letter pathsEPSS 0.9%CVE-2026-42305HIGHDulwich has an arbitrary file write via NTFS-hostile tree entries on WindowsEPSS 0.6%CVE-2026-42563HIGHDulwich Vulnerable to Command Injection via Merge Driver PathEPSS 0.6%CVE-2026-114095HIGHDulwich before 1.2.9 Infinite Loop DoS via Pack.resolve_objectEPSS 0.3%CVE-2026-47734MEDIUMDulwich has unbounded memory allocation in receive-pack from crafted thin packsEPSS 0.2%CVE-2026-114097HIGHDulwich 0.23.1 before 1.2.8 Symlink Path Traversal via filter_branch Index FilterEPSS 0.2%