Bug 2370014 (CVE-2025-4330) - CVE-2025-4330 cpython: Extraction filter bypass for linking outside extraction directory
Summary: CVE-2025-4330 cpython: Extraction filter bypass for linking outside extractio...
Keywords:
Status: NEW
Alias: CVE-2025-4330
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2370024
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-06-03 14:01 UTC by OSIDB Bzimport
Modified: 2025-06-18 23:50 UTC (History)
9 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2025-06-03 14:01:25 UTC
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. Only Python versions 3.12 or later are affected by these vulnerabilities, earlier versions don't include the extraction filter feature.

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.


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