CVE-2025-4330

Description

Allows the extraction filter to be ignored, allowing symlink targets to point outside the destination directory, and the modification of some file metadata. 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 Products

Python tarfile module in versions supporting extraction filters (Python 3.11.4+, 3.12.0+, 3.13.0+ where filters were introduced). Specifically affected: (1) Any Python 3.11.4, 3.12.0, 3.13.0+ application using TarFile.extractall(filter='data') or TarFile.extractall(filter='tar'); (2) Python 3.14+ applications not explicitly setting filter parameter (new default 'data' filter); (3) All operating systems running affected Python versions (CPE scope: cpe:2.3:a:python:python:*). Third-party applications affected include: pip (if using tarfile for source distribution extraction), conda, artifact management systems, container image extraction tools, and any software performing untrusted tar extraction. The vulnerability does NOT significantly affect source distribution installation since build processes already permit arbitrary code execution.

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