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Advisory record · GHSA-8mcx-5rqc-vhmf

Dulwich: Arbitrary File Write (RCE) on Windows via Unvalidated Drive Letters in Tree Paths

CVSS 8.7 HighEPSS 0.0095 · 61st percentile

Published by the GitHub Advisory Database at 2 Oct 2026, 19:14 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
dulwichPyPI<1.2.91.2.9
Identifiers
GHSA-8mcx-5rqc-vhmf · CVE-2026-114094
Weakness (CWE)
CWE-22
Tags
Published
2 Oct 2026
Updated
21 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Dulwich versions before 1.2.9 are vulnerable on Windows. When checking out a repository, a malicious Git tree entry containing a DOS drive letter (such as "C:") is not rejected, so files can be written outside the worktree. An attacker who gets a Windows user or CI runner to clone a crafted repository could potentially achieve arbitrary file write and remote code execution. Upgrade to Dulwich 1.2.9 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.7 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0095, the 61st percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:08 UTC First seen by agentprime
  2. 31 Oct 2026, 14:08 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.