Bug 2511184 (CVE-2026-47764)

Summary:	CVE-2026-47764 pdm: pdm: Arbitrary file write via path traversal in wheel installation
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in pdm, a Python package and dependency manager. This vulnerability allows a remote attacker to write arbitrary files to a system by crafting a malicious Python 'wheel' package. The flaw occurs during the installation process, where a critical function responsible for writing files to the system fails to properly validate file paths, enabling path traversal. This could lead to unauthorized system modifications or the execution of malicious code.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Description OSIDB Bzimport 2026-08-04 19:02:18 UTC

pdm is a Python package and dependency manager supporting the latest PEP standards. Versions prior to 2.27.0 are vulnerable to path traversal through write_to_fs. InstallDestination.write_to_fs() in src/pdm/installers/installers.py overrides the base class to add symlink/hardlink support but replaces the safe _path_with_destdir() (which validates via Path.resolve() + is_relative_to()) with a bare os.path.join() that performs no path validation. A malicious wheel with traversal entries can write arbitrary files. This issue has been fixed in version 2.27.0.