CVE-2025-4435

HIGH

CPython TarFile - Incorrect Extraction with errorlevel=0

Title source: llm

Description

When using a TarFile.errorlevel = 0 and extracting with a filter the documented behavior is that any filtered members would be skipped and not extracted. However the actual behavior of TarFile.errorlevel = 0 in affected versions is that the member would still be extracted and not skipped.

References (11)

[Issue Tracking] https://github.com/python/cpython/issues/135034

[Various Sources] https://mail.python.org/archives/list/[email protected]/thread/MAXIJJCUUMCL7ATZNDVEGGHUMQMUUKLG/

[Patch] https://github.com/python/cpython/commit/3612d8f51741b11f36f8fb0494d79086bac9390a

[Patch] https://github.com/python/cpython/commit/9e0ac76d96cf80b49055f6d6b9a6763fb9215c2a

[Patch] https://github.com/python/cpython/commit/19de092debb3d7e832e5672cc2f7b788d35951da

[Patch] https://github.com/python/cpython/commit/aa9eb5f757ceff461e6e996f12c89e5d9b583b01

[Patch] https://github.com/python/cpython/commit/28463dba112af719df1e8b0391c46787ad756dd9

[Patch] https://github.com/python/cpython/commit/4633f3f497b1ff70e4a35b6fe2c907cbe2d4cb2e

[Patch] https://github.com/python/cpython/commit/9c1110ef6652687d7c55f590f909720eddde965a

[Patch] https://github.com/python/cpython/commit/dd8f187d0746da151e0025c51680979ac5b4cfb1

View Patch ZIP pw:eip

[Issue Tracking] https://github.com/python/cpython/pull/135037

Scores

CVSS v3 7.5

EPSS 0.0054

EPSS Percentile 67.7%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-682

Status published

Products (7)

Python Software Foundation/CPython < 3.10.18

Python Software Foundation/CPython < 3.9.23

Python Software Foundation/CPython 3.10.0 - 3.10.18

Python Software Foundation/CPython 3.11.0 - 3.11.13

Python Software Foundation/CPython 3.12.0 - 3.12.11

Python Software Foundation/CPython 3.13.0 - 3.13.4

Python Software Foundation/CPython 3.14.0a1 - 3.14.0b3

Published Jun 03, 2025

Tracked Since Feb 18, 2026