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Dulwich CVE-2026-52726

| EUVDEUVD-2026-36195 HIGH
Path Traversal (CWE-22)
2026-06-10 GitHub_M GHSA-gfhv-vqv2-4544
Path Traversal Python RCE Dulwich
7.5
CVSS 3.1 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
8.8 HIGH

Network-delivered via malicious repo (AV:N), no auth on attacker side (PR:N), but victim must initiate the recursive clone (UI:R); resulting hook execution yields full C/I/A compromise.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
5.4 MEDIUM
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Patch available
Jul 02, 2026 - 19:01 EUVD
Source Code Evidence Fetched
Jun 10, 2026 - 22:53 vuln.today
Analysis Generated
Jun 10, 2026 - 22:53 vuln.today

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 1 pypi packages depend on dulwich (1 direct, 0 indirect)

Ecosystem-wide dependent count for version 0.23.2.

DescriptionCVE.org

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.

Articles & Coverage 1

News 7 New Python Vulnerabilities - 1 Critical, 6 High Severity Jun 11, 2026

AnalysisAI

Arbitrary code execution in Dulwich (pure-Python Git implementation) versions 0.23.2 through 1.2.4 allows a malicious upstream repository to drop executable files into a victim's .git/hooks/ directory during a recursive clone or submodule update. When the victim subsequently runs any git or dulwich command that invokes the planted hook, the attacker's code executes with the victim's privileges. No public exploit identified at time of analysis, though the technique mirrors the well-documented upstream Git flaws CVE-2024-32002 and CVE-2024-32004.

Technical ContextAI

Dulwich is a pure-Python reimplementation of Git's file formats and wire protocols, used by tools like Bazaar, GitPython alternatives, and various build/CI systems that prefer avoiding a native git dependency (CPE cpe:2.3:a:jelmer:dulwich). The flaw (CWE-22, Path Traversal) lives in dulwich.porcelain.submodule_update, which materializes submodules using the path field from a crafted .gitmodules and the matching tree gitlink without validating that the path stays inside the working tree. Because dulwich reimplemented Git's submodule porcelain independently, the hardening upstream Git added for CVE-2024-32002 / CVE-2024-32004 (rejecting submodule paths that traverse into .git or escape the work tree) was never carried over, so a path of '.git/hooks' is accepted verbatim and the submodule's tree contents - executable bits preserved - are written into the live hooks directory.

RemediationAI

Vendor-released patch: dulwich 1.2.5 (https://github.com/jelmer/dulwich/releases/tag/dulwich-1.2.5) - upgrade immediately, which is the primary remediation as it adds submodule path validation rejecting entries that resolve inside .git or above the work tree. If an immediate upgrade is not possible, avoid calling porcelain.clone with recurse_submodules=True and avoid porcelain.submodule_update against any repository whose .gitmodules content is not fully trusted; the trade-off is that submodules must then be initialized manually or via the system git binary (which already carries the CVE-2024-32002/32004 fixes). For CI/build systems that ingest third-party repositories, route recursive submodule operations through native git instead of dulwich until the upgrade is rolled out, and audit existing checkout caches for unexpected files in .git/hooks/ as a compromise indicator. Also review the bundled fixes in 1.2.5 for CVE-2026-42305, CVE-2026-42563, and CVE-2026-47712, which apply to the same release.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 12 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Not-Affected
SUSE Linux Enterprise Server 15 SP7 Not-Affected

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CVE-2026-52726 vulnerability details – vuln.today
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