URL Parsing Vulnerability in Python Standard Library Functions by Python Software Foundation
CVE-2025-0938

6.3MEDIUM

Key Information:

Vendor
Python Software Foundation
Status
Cpython
Vendor
CVE Published:
31 January 2025

Summary

The Python standard library functions urllib.parse.urlsplit and urlparse improperly handle domain names containing square brackets, which deviate from standard URL syntax as defined in RFC 3986. This vulnerability may lead to inconsistent behavior between the Python URL parser and other parsers that adhere strictly to the specification, potentially causing security issues in applications that rely on these functions for processing URLs. Users are encouraged to review their implementations for compliance.

Affected Version(s)

CPython 0 < 3.12.9

CPython 3.13.0 < 3.13.2

CPython 3.14.0a1 < 3.14.0a5

References

https://github.com/python/cpython/issues/105704
issue-tracking
https://github.com/python/cpython/pull/129418
patch
https://mail.python.org/archives/list/security-announce@p...
vendor-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.