PYSEC-2026-2861

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/pdm/PYSEC-2026-2861.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-2861
Aliases
Published
2026-07-13T15:46:16Z
Modified
2026-07-13T16:32:55Z
Severity
  • 7.1 (High) CVSS_V4 - 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 CVSS Calculator
Summary
PDM wheel installation leads to Path Traversal via overridden write_to_fs
Details

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.

References

Affected packages

PyPI / pdm

Package

Name
pdm
View open source insights on deps.dev
Purl
pkg:pypi/pdm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.27.0

Affected versions

0.*
0.0.0
0.0.1
0.0.3
0.0.4
0.0.5
0.0.6
0.1.0
0.1.1
0.1.2
0.2.0
0.2.1
0.2.2
0.2.3
0.2.4
0.2.5
0.2.6
0.3.0
0.3.1
0.3.2
0.4.0
0.4.1
0.4.2
0.5.0
0.6.0
0.6.1
0.6.2
0.6.3
0.6.4
0.6.5
0.7.0
0.7.1
0.8.0
0.8.1
0.8.2
0.8.3
0.8.4
0.8.5
0.8.6
0.8.7
0.9.0
0.9.1
0.9.2
0.10.0
0.10.1
0.10.2
0.11.0
0.12.0
0.12.1
0.12.2
0.12.3
1.*
1.0.0b0
1.0.0b2
1.0.0
1.1.0
1.2.0
1.2.0.post1
1.3.0
1.3.1
1.3.2
1.3.3
1.3.4
1.4.0
1.4.1
1.4.2
1.4.3
1.4.4
1.4.5
1.5.0b0
1.5.0b1
1.5.0
1.5.1
1.5.2
1.5.3
1.6.0
1.6.1
1.6.2
1.6.3
1.6.4
1.7.0
1.7.1
1.7.2
1.8.0
1.8.1
1.8.2
1.8.3
1.8.4
1.8.5
1.9.0
1.10.0
1.10.1
1.10.2
1.10.3
1.11.0
1.11.1
1.11.2
1.11.3
1.12.0
1.12.1
1.12.2
1.12.3
1.12.4
1.12.5
1.12.6
1.12.7
1.12.8
1.13.0
1.13.0.post0
1.13.1
1.13.2
1.13.3
1.13.4
1.13.5
1.13.6
1.14.0
1.14.1
1.15.0
1.15.1
1.15.2
1.15.3
1.15.4
1.15.5
2.*
2.0.0a1
2.0.0b1
2.0.0b2
2.0.0
2.0.1
2.0.2
2.0.3
2.1.0
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.2.0
2.2.1
2.3.0
2.3.1
2.3.2
2.3.3
2.3.4
2.4.0
2.4.1
2.4.2
2.4.3
2.4.4
2.4.5
2.4.6
2.4.7
2.4.8
2.4.9
2.5.0b0
2.5.0
2.5.1
2.5.2
2.5.3
2.5.4
2.5.5
2.5.6
2.6.0
2.6.1
2.7.0
2.7.1
2.7.2
2.7.3
2.7.4
2.8.0a0
2.8.0a1
2.8.0a2
2.8.0
2.8.1
2.8.2
2.9.0
2.9.1
2.9.2
2.9.3
2.10.0
2.10.1
2.10.2
2.10.3
2.10.4
2.11.0
2.11.1
2.11.2
2.12.0
2.12.1
2.12.2
2.12.3
2.12.4
2.13.0
2.13.1
2.13.2
2.13.3
2.14.0
2.15.0
2.15.1
2.15.2
2.15.3
2.15.4
2.16.0
2.16.1
2.17.0
2.17.1
2.17.2
2.17.3
2.18.0
2.18.1
2.18.2
2.19.0a0
2.19.0
2.19.1
2.19.2
2.19.3
2.20.0
2.20.0.post1
2.20.1
2.21.0
2.22.0
2.22.1
2.22.2
2.22.3
2.22.4
2.23.0
2.23.1
2.24.0
2.24.1
2.24.2
2.25.0
2.25.1
2.25.2
2.25.3
2.25.4
2.25.5
2.25.6
2.25.7
2.25.8
2.25.9
2.26.0
2.26.1
2.26.2
2.26.3
2.26.4
2.26.5
2.26.6
2.26.7
2.26.8
2.26.9

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/pdm/PYSEC-2026-2861.yaml"