CVE-2025-0938
URL parser allowed square brackets in domain names
- State
- Published
- Severity
- 6.3 Medium
- Published
- Jan 31, 2025
- Updated
- Jul 31, 2026
- Reserved
- Jan 31, 2025
Description
The Python standard library functions `urllib.parse.urlsplit` and `urlparse` accepted domain names that included square brackets which isn't valid according to RFC 3986. Square brackets are only meant to be used as delimiters for specifying IPv6 and IPvFuture hosts in URLs. This could result in differential parsing across the Python URL parser and other specification-compliant URL parsers.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N | PSF |
Weaknesses
- CWE-20 Improper Input Validation
Affected Products
| Product | Versions |
|---|---|
CPythonPython Software Foundation |
|
References
- https://github.com/python/cpython/issues/105704issue-tracking
- https://github.com/python/cpython/pull/129418patch
- https://mail.python.org/archives/list/security-announce@python.org/thread/K4EUG6EKV6JYFIC24BASYOZS4M5XOQIB/vendor-advisory
- https://github.com/python/cpython/commit/d89a5f6a6e65511a5f6e0618c4c30a7aa5aba56apatch
- https://github.com/python/cpython/commit/90e526ae67b172ed7c6c56e7edad36263b0f9403patch
- https://github.com/python/cpython/commit/a7084f6075c9595ba60119ce8c62f1496f50c568patch
- https://github.com/python/cpython/commit/526617ed68cde460236c973e5d0a8bad4de896bapatch
- https://github.com/python/cpython/commit/b8b4b713c5f8ec0958c7ef8d29d6711889bc94abpatch
- https://github.com/python/cpython/commit/ff4e5c25666f63544071a6b075ae8b25c98b7a32patch
- https://security.netapp.com/advisory/ntap-20250314-0002/
- https://lists.debian.org/debian-lts-announce/2025/03/msg00013.html
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