🛡️ CVE-2025-4517 — libpython

🔴 CVSS 9.5 — Critical ✅ No Known Exploit NVD
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Arbitrary writes via tarfile realpath overflow

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability low.

Affected software

CVE-2025-4517 is recorded against 4 packages.

  • libpython
  • python
  • python-min
  • unknown

Timeline and source

Published on 11 August 2025. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

gist.github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
mail.python.org (Web)
nvd.nist.gov (Web)

CVE-2025-4517 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity CRITICAL
CVSS Score 9.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-08-11
Updated 2026-08-12
Modified 2025-08-11
Fix URL N/A

Affected Packages

Software From version Fixed in
libpython — —
python — —
python-min — —
unknown — —

References

Exploit Protection

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CVE-2025-4517 carries CVSS 9.5 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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