9.4

CVE-2025-4517

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerPython Software Foundation
≫
Produkt CPython
Default Statusunaffected
Version 0
Version < 3.10.18
Status affected
Version 3.11.0
Version < 3.11.13
Status affected
Version 3.12.0
Version < 3.12.11
Status affected
Version 3.13.0
Version < 3.13.4
Status affected
Version 3.14.0a1
Version < 3.14.0b3
Status affected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 1.18% 0.637
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
cna@python.org 9.4 3.9 5.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

https://github.com/python/cpython/issues/135034
https://github.com/python/cpython/pull/135037
https://gist.github.com/sethmlarson/52398e33eff261329a0180ac1d54f42f
https://github.com/python/cpython/commit/3612d8f51741b11f36f8fb0494d79086bac9390a
https://github.com/python/cpython/commit/9e0ac76d96cf80b49055f6d6b9a6763fb9215c2a
https://mail.python.org/archives/list/security-announce@python.org/thread/MAXIJJCUUMCL7ATZNDVEGGHUMQMUUKLG/
https://github.com/python/cpython/commit/19de092debb3d7e832e5672cc2f7b788d35951da
https://github.com/python/cpython/commit/aa9eb5f757ceff461e6e996f12c89e5d9b583b01
https://github.com/python/cpython/commit/28463dba112af719df1e8b0391c46787ad756dd9
https://github.com/python/cpython/commit/4633f3f497b1ff70e4a35b6fe2c907cbe2d4cb2e
https://github.com/python/cpython/commit/9c1110ef6652687d7c55f590f909720eddde965a
https://github.com/python/cpython/commit/dd8f187d0746da151e0025c51680979ac5b4cfb1