Vulnerability in Tarfile.extract() Function Affects Python Package
CVE-2026-4360

2LOW

Key Information:

Vendor

Python Software Foundation

Status
Cpython
Vendor
CVE Published:
30 June 2026

What is CVE-2026-4360?

The Tarfile.extract() function in Python improperly processes the filter parameter during the extraction of hardlinks. This issue allows malicious actors to exploit affected systems by extracting content from untrusted tar files, resulting in unintended ownership changes of the files (uid/gid). This behavior could lead to unauthorized access or system compromise, emphasizing the need for vigilance and prompt patching.

Affected Version(s)

CPython 0 < 3.15.0

References

https://mail.python.org/archives/list/security-announce@p...
vendor-advisory
https://github.com/python/cpython/pull/151988
patch
https://github.com/python/cpython/issues/151987
issue-tracking

CVSS V4

Score:
2
Severity:
LOW
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Michael Scovetta (https://github.com/scovetta)
Seth Larson (https://github.com/sethmlarson)
Petr Viktorin (https://github.com/encukou)
.