PYSEC-2026-2861
Vulnerability from pysec - Published: 2026-07-13 15:46 - Updated: 2026-07-13 16:05
VLAI
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.
Severity
Impacted products
| Name | purl | pdm | pkg:pypi/pdm |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "pdm",
"purl": "pkg:pypi/pdm"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.27.0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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",
"0.10.0",
"0.10.1",
"0.10.2",
"0.11.0",
"0.12.0",
"0.12.1",
"0.12.2",
"0.12.3",
"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",
"1.0.0",
"1.0.0b0",
"1.0.0b2",
"1.1.0",
"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",
"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",
"1.5.0",
"1.5.0b0",
"1.5.0b1",
"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",
"2.0.0",
"2.0.0a1",
"2.0.0b1",
"2.0.0b2",
"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",
"2.10.0",
"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",
"2.19.0",
"2.19.0a0",
"2.19.1",
"2.19.2",
"2.19.3",
"2.2.0",
"2.2.1",
"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",
"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",
"2.5.0",
"2.5.0b0",
"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",
"2.8.0",
"2.8.0a0",
"2.8.0a1",
"2.8.0a2",
"2.8.1",
"2.8.2",
"2.9.0",
"2.9.1",
"2.9.2",
"2.9.3"
]
}
],
"aliases": [
"CVE-2026-47764",
"GHSA-78v8-vpjp-cjqh"
],
"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.",
"id": "PYSEC-2026-2861",
"modified": "2026-07-13T16:05:29.365980Z",
"published": "2026-07-13T15:46:16.093778Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pdm-project/pdm/security/advisories/GHSA-78v8-vpjp-cjqh"
},
{
"type": "WEB",
"url": "https://github.com/pdm-project/pdm/pull/3787"
},
{
"type": "PACKAGE",
"url": "https://github.com/pdm-project/pdm"
},
{
"type": "WEB",
"url": "https://github.com/pdm-project/pdm/releases/tag/2.27.0"
},
{
"type": "PACKAGE",
"url": "https://pypi.org/project/pdm"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-78v8-vpjp-cjqh"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47764"
}
],
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "PDM wheel installation leads to Path Traversal via overridden write_to_fs"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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