CVE-2026-42563
Dulwich is a pure-Python implementation of the Git file formats and protocols. Starting in version 0.24.0 and prior to version 1.2.5, Dulwich's `ProcessMergeDriver` substitutes the file path (from the git tree, controllable by an attacker via a malicious branch) into the merge driver command via the `%P` placeholder and executes it with `subprocess.run(..., shell=True)`. An attacker who can cause a victim to merge an untrusted branch can achieve arbitrary command execution by crafting malicious file paths. Version 1.2.5 fixes the issue.
- Fix
- Available
- CVSS 4.0
- 7.7 HIGH
- EPSS
- 0.6% (43th percentile)
- Weakness
- CWE-78
- NVD status
- Deferred
- Published
- 2026-06-10
No indexed exploits for CVE-2026-42563 yet
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