CVE-2025-4517

Summary

Allows arbitrary filesystem writes outside the extraction directory during extraction with filter="data".

You are affected by this vulnerability if using the tarfile module to extract untrusted tar archives using TarFile.extractall() or TarFile.extract() using the filter= parameter with a value of "data" or "tar". See the tarfile extraction filters documentation https://docs.python.org/3/library/tarfile.html#tarfile-extraction-filter  for more information.

Note that for Python 3.14 or later the default value of filter= changed from "no filtering" to `"data", so if you are relying on this new default behavior then your usage is also affected.

Note that none of these vulnerabilities significantly affect the installation of source distributions which are tar archives as source distributions already allow arbitrary code execution during the build process. However when evaluating source distributions it's important to avoid installing source distributions with suspicious links.

Affected Software

VendorProductVersion RangeStatus
Python Software FoundationCPython0 < 3.10.18affected
Python Software FoundationCPython3.11.0 < 3.11.13affected
Python Software FoundationCPython3.12.0 < 3.12.11affected
Python Software FoundationCPython3.13.0 < 3.13.4affected
Python Software FoundationCPython3.14.0a1 < 3.14.0b3affected

Weaknesses

  • CWE-22: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: total

References