---
id: "CVE-2026-114094"
kind: "vulnerability"
aliases: ["CVE-2026-114094"]
title: "Dulwich: Windows drive-letter tree entries let a repo write files outside worktree"
severity: "high"
cvss: 8.8
epss: 0.0067
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["dulwich", "package", "python", "windows"]
not_affected_if: ["dulwich-at-1.2.9-or-later", "non-windows-hosts", "only-trusted-repositories"]
published_at: "2026-10-21T01:17:34+00:00"
first_seen_at: "2026-10-23T21:57:28+00:00"
updated_at: "2026-10-24T13:15:54+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-114094", "first_seen_at": "2026-10-23T21:57:28+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-114094", "first_seen_at": "2026-10-24T13:15:54+00:00"}]
---

# Dulwich: Windows drive-letter tree entries let a repo write files outside worktree

Dulwich, a pure-Python Git library, does not reject Git tree entries named like DOS drive letters (such as 'C:') on Windows. A malicious repository can therefore write files outside the checkout and achieve remote code execution.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

Run pip show dulwich on Windows machines or CI runners that check out untrusted repositories and compare the version to 1.2.9.

## Fix

Upgrade dulwich to 1.2.9 or later.

## Timeline

- 2026-10-23T21:57:28+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-114094
- 2026-10-24T13:15:54+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-114094

## From the sources

Dulwich before 1.2.9 fails to validate DOS drive letter prefixes in Git tree path elements on Windows, allowing arbitrary file write. Attackers can craft a malicious repository with a tree entry named 'C:' that bypasses NTFS validation and writes files outside the worktree to achieve remote code execution.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_