// For flags

CVE-2025-4435

Tarfile extracts filtered members when errorlevel=0

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

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.

A flaw was found in CPython's tarfile module. This vulnerability allows unauthorized file extraction via crafted tar archives when TarFile.errorlevel=0, bypassing expected filtering mechanisms.

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.

These are all security issues fixed in the python314-3.14.0~b3-3.1 package on the GA media of openSUSE Tumbleweed.

*Credits: Chuck Woodraska, Petr Viktorin, Serhiy Storchaka, Hugo van Kemenade, Łukasz Langa, Thomas Wouters, Seth Larson, Matt Prodani
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Complete
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2025-05-08 CVE Reserved
  • 2025-06-03 CVE Published
  • 2025-07-05 EPSS Updated
  • 2025-07-07 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-682: Incorrect Calculation
  • CWE-706: Use of Incorrectly-Resolved Name or Reference
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Python Software Foundation
Search vendor "Python Software Foundation"
 CPython
Search vendor "Python Software Foundation" for product "CPython"
 < 3.9.23
Search vendor "Python Software Foundation" for product "CPython" and version " < 3.9.23"
en
Affected
Python Software Foundation
Search vendor "Python Software Foundation"
 CPython
Search vendor "Python Software Foundation" for product "CPython"
 >= 3.10.0 < 3.10.18
Search vendor "Python Software Foundation" for product "CPython" and version " >= 3.10.0 < 3.10.18"
en
Affected
Python Software Foundation
Search vendor "Python Software Foundation"
 CPython
Search vendor "Python Software Foundation" for product "CPython"
 >= 3.11.0 < 3.11.13
Search vendor "Python Software Foundation" for product "CPython" and version " >= 3.11.0 < 3.11.13"
en
Affected
Python Software Foundation
Search vendor "Python Software Foundation"
 CPython
Search vendor "Python Software Foundation" for product "CPython"
 >= 3.12.0 < 3.12.11
Search vendor "Python Software Foundation" for product "CPython" and version " >= 3.12.0 < 3.12.11"
en
Affected
Python Software Foundation
Search vendor "Python Software Foundation"
 CPython
Search vendor "Python Software Foundation" for product "CPython"
 >= 3.13.0 < 3.13.4
Search vendor "Python Software Foundation" for product "CPython" and version " >= 3.13.0 < 3.13.4"
en
Affected