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CVE-2026-42563— Dulwich Vulnerable to Command Injection via Merge Driver Path

Quick assessment

Affected
jelmer dulwich
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Dulwich是Jelmer Vernooij个人开发者的一款纯Python实现的Git仓库操作接口。 Dulwich 0.24.0版本至1.2.5之前版本存在操作系统命令注入漏洞，该漏洞源于ProcessMergeDriver将文件路径替换到合并驱动命令中并执行，可能导致攻击者通过恶意分支实现任意命令执行。

AI Predicted 9.8 Difficulty: Easy EPSS 0.80% · P56

Affected Version Matrix 1

VendorProduct Version RangeStatus
jelmer dulwich >= 0.24.0, < 1.2.5 affected
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I. Basic Information for CVE-2026-42563

Vulnerability Information
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Vulnerability Title
Dulwich Vulnerable to Command Injection via Merge Driver Path
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Dulwich 操作系统命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Dulwich是Jelmer Vernooij个人开发者的一款纯Python实现的Git仓库操作接口。 Dulwich 0.24.0版本至1.2.5之前版本存在操作系统命令注入漏洞，该漏洞源于ProcessMergeDriver将文件路径替换到合并驱动命令中并执行，可能导致攻击者通过恶意分支实现任意命令执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jelmer dulwich >= 0.24.0, < 1.2.5 -

II. Public POCs for CVE-2026-42563

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III. Intelligence Information for CVE-2026-42563

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Patches & Fixes for CVE-2026-42563 (1)

Vendor Advisories for CVE-2026-42563 (1)

Vendor Pages for CVE-2026-42563 (1)

Same Patch Batch · jelmer · 2026-06-10 · 5 CVEs total

CVE-2026-42305 8.8 HIGH Dulwich has an arbitrary file write via NTFS-hostile tree entries on Windows
CVE-2026-52726 7.5 HIGH Dulwich's submodule path traversal in porcelain.submodule_update / porcelain.clone(recurse
CVE-2026-47734 5.7 MEDIUM Dulwich has unbounded memory allocation in receive-pack from crafted thin packs
CVE-2026-47712 3.3 LOW Dulwich doesn't sanitize commit subjects in `porcelain.format_patch`

IV. Related Vulnerabilities

Same product: dulwich
Same vendor: jelmer
Same weakness: CWE-78

V. Comments for CVE-2026-42563

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