Bug 2487769 (CVE-2026-52726)

Summary:	CVE-2026-52726 dulwich: Dulwich: Arbitrary code execution via crafted Git submodules
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	anthomas, dschmidt, ehelms, erezende, ggainey, jdobes, jkoehler, jlanda, jpasqual, juwatts, kgaikwad, kshier, lphiri, mhulan, nmoumoul, orabin, osousa, pcreech, rchan, rhel-process-autobot, simaishi, smallamp, smcdonal, stcannon, teagle, tmalecek, watson-tool-maintainers, yguenane
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
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Doc Text:	A flaw was found in Dulwich, a pure-Python implementation of Git file formats and protocols. This vulnerability allows a remote attacker to achieve arbitrary code execution by crafting a malicious Git submodule. When a user clones or updates a repository with such a submodule, the attacker-controlled content is written into the victim's Git hooks directory. Subsequent Git or Dulwich commands can then execute these malicious files, leading to system compromise.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2490553
Bug Blocks:

Description OSIDB Bzimport 2026-06-10 23:02:13 UTC

Dulwich is a pure-Python implementation of the Git file formats and protocols. Starting in version 0.23.2 and prior to version 1.2.5, `dulwich.porcelain.submodule_update`, and by extension `porcelain.clone(..., recurse_submodules=True)`, materializes attacker-controlled submodule paths from a crafted upstream repository without path validation. A malicious `.gitmodules` plus a matching tree gitlink whose `path` is `.git/hooks` (or any other directory inside the parent repository's `.git` directory) causes the attacker's submodule tree contents to be written directly into the victim's `.git/hooks/` directory, preserving executable mode bits. The dropped executables are then run by any subsequent `git` or `dulwich` command that invokes the matching hook, resulting in arbitrary code execution. This is the dulwich equivalent of the upstream Git fixes for CVE-2024-32002 / CVE-2024-32004, which were never propagated into dulwich's separately implemented submodule porcelain. Version 1.2.5 patches the issue.