Improper Extraction Behavior in Python TarFile Module
CVE-2025-4435

7.5HIGH

Key Information:

Vendor

Python Software Foundation

Status
Cpython
Vendor
CVE Published:
3 June 2025

What is CVE-2025-4435?

In the TarFile module of Python, a flaw exists when TarFile.errorlevel is set to 0 while extracting files with a filter. Expected behavior dictates that filtered members should be omitted from extraction. However, a flaw in the processing logic leads to these members being extracted nonetheless, causing unintended data exposure. This can potentially lead to security concerns if sensitive information is inadvertently extracted.

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Affected Version(s)

CPython 0 < 3.9.23

CPython 3.10.0 < 3.10.18

CPython 3.11.0 < 3.11.13

References

https://github.com/python/cpython/issues/135034
issue-tracking
https://github.com/python/cpython/pull/135037
patch
https://mail.python.org/archives/list/security-announce@p...
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Chuck Woodraska
Petr Viktorin
Serhiy Storchaka
Hugo van Kemenade
Łukasz Langa
Thomas Wouters
Seth Larson
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