CVE-2026-42563

HIGH EPSS 42.1%
Published Jun 10, 20263w ago · Modified Jun 17, 20262w ago
7.7 CVSS 4.0
High
Find Similar
Published Jun 10, 2026 3w ago
Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score
7.7
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction P
Scope X

Threat Intelligence

EPSS Exploit Probability
42.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-78 OS Command Injection Injection

References 3

  • github.com https://github.com/jelmer/dulwich/commit/e3331b3b3a122fc313460182f928f59723580b7b
  • github.com https://github.com/jelmer/dulwich/releases/tag/dulwich-1.2.5
  • github.com https://github.com/jelmer/dulwich/security/advisories/GHSA-9277-mp7x-85jf

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.