CVE-2026-47764
PDM wheel installation leads to Path Traversal via overridden write_to_fs
Description
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. Same class as Poetry CVE-2026-34591. Fix ready at: https://github.com/pdm-project/pdm/pull/3787.
How to fix CVE-2026-47764
To remediate CVE-2026-47764, upgrade the affected package to a fixed version below.
- PyPI/pdm—upgrade to 2.27.0 or later
Is CVE-2026-47764 being exploited?
No exploitation signal available. Neither CISA KEV nor a current EPSS score has been published for CVE-2026-47764.
Affected packages (1)
- from 0, < 2.27.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |