CVE-2026-114094

HIGH 8.8

Dulwich before 1.2.9 Arbitrary File Write via DOS drive letter paths

CVSS Score

8.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-22
Vendor	jelmer
Product	dulwich
Published	Oct 21, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

jelmer / dulwich

0 < 1.2.9

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 LukeBanto jelmer