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CVE-2025-4138
June 03, 2025
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.
Affected Packages
https://github.com/python/cpython.git (GITHUB):
Affected version(s) >=v3.11.0 <v3.11.13
Fix Suggestion:
Update to version v3.11.13
https://github.com/python/cpython.git (GITHUB):
Affected version(s) >=v3.12.0 <v3.12.11
Fix Suggestion:
Update to version v3.12.11
https://github.com/python/cpython.git (GITHUB):
Affected version(s) >=v3.10.0 <v3.10.18
Fix Suggestion:
Update to version v3.10.18
https://github.com/python/cpython.git (GITHUB):
Affected version(s) >=v3.13.0 <v3.13.4
Fix Suggestion:
Update to version v3.13.4
https://github.com/python/cpython.git (GITHUB):
Affected version(s) >=v0.9.8 <v3.9.23
Fix Suggestion:
Update to version v3.9.23
Additional Notes
The description of this vulnerability differs from MITRE.
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
EPSS
Base Score:
0.10