CVE-2026-41140: Poetry: Path traversal in tar extraction on Python 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4

Severity: high (CVSS 8.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-24 · updated 2026-10-26
Weakness: CWE-22

Description

Poetry is a dependency manager for Python. Prior to 2.3.4, the extractall() function in src/poetry/utils/helpers.py:410-426 extracts sdist tarballs without path traversal protection on Python versions where tarfile.data_filter is unavailable. Considering only Python versions which are still supported by Poetry, these are 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4. This vulnerability is fixed in 2.3.4.

Affected products

python-poetry poetry: before 2.3.4

References

https://github.com/python-poetry/poetry/security/advisories/GHSA-73h3-mf4w-8647
https://access.redhat.com/errata/RHSA-2026:24866
https://access.redhat.com/security/cve/CVE-2026-41140
https://bugzilla.redhat.com/show_bug.cgi?id=2461604
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41140.json

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