High
pdm: Path traversal in wheel installation via overridden write_to_fs
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-47764
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 03:04 UTC · Revision 1
Source evidence
pdm: Path traversal in wheel installation via overridden write_to_fs
core-osv · Original sourcePublished 4 Aug 2026, 17:57 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.
osv:CVE-2026-47764
Complete source record
{
"id": "19cd937fed3be22490346ad44b594e350ce77bf44287d216a1048029d8eebe19",
"url": "https://osv.dev/vulnerability/CVE-2026-47764",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "pdm: Path traversal in wheel installation via overridden write_to_fs",
"summary": "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.",
"evidence": "osv:CVE-2026-47764",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-47764",
"aliases": [
"CVE-2026-47764",
"GHSA-78v8-vpjp-cjqh",
"PYSEC-2026-2861"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
}
],
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}
}
],
"modified": "2026-10-28T02:30:49.116771214Z",
"provider": "osv",
"references": [
"https://github.com/pdm-project/pdm/releases/tag/2.27.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47764.json",
"https://github.com/pdm-project/pdm/security/advisories/GHSA-78v8-vpjp-cjqh",
"https://nvd.nist.gov/vuln/detail/CVE-2026-47764"
],
"provider_metadata": {
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}
},
"related_cves": [
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"evidence": "/id"
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},
"source_id": "core-osv",
"document_id": 517600,
"published_at": "2026-08-04T17:57:15.756+00:00"
}