What’s Vulnerable › Vulnerabilities

CVE-2026-47764: pdm: Path traversal in wheel installation via overridden write_to_fs

• Severity: high (CVSS 8.4 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-04 · updated 2026-10-24
• Weakness: CWE-22

Description

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.

Affected products

• pdm-project pdm: before 2.27.0

References

• https://github.com/pdm-project/pdm/releases/tag/2.27.0
• https://github.com/pdm-project/pdm/security/advisories/GHSA-78v8-vpjp-cjqh

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