What’s Vulnerable › Vulnerabilities

CVE-2026-114094: Dulwich before 1.2.9 Arbitrary File Write via DOS drive letter paths

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-21 · updated 2026-10-28
• Weakness: CWE-22

Description

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.

Affected products

• Pypi Dulwich: before 1.2.9; 0.0.1, 0.1.0, 0.1.1, 0.10.0, 0.10.1a, 0.11.0 (+165) — fixed in 1.2.9
• jelmer dulwich: before 1.2.9 — fixed in 1.2.9

How to fix

Upgrade to a fixed version: Pypi Dulwich 1.2.9; jelmer dulwich 1.2.9. Check the vendor advisory for mitigations.

References

• https://github.com/jelmer/dulwich/security/advisories/GHSA-8mcx-5rqc-vhmf
• https://www.vulncheck.com/advisories/dulwich-before-1.2.9-arbitrary-file-write-via-dos-drive-letter-paths
• https://github.com/jelmer/dulwich/security/advisories/GHSA-8mcx-5rqc-vhmf

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