CVE-2025-0938
URL parser allowed square brackets in domain names
CVSS Score
0.0
EPSS Score
1.4%
EPSS Percentile
81th
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.
| CWE | CWE-20 |
| Vendor | python software foundation |
| Product | cpython |
| Published | Jan 31, 2025 |
| Last Updated | Apr 21, 2026 |
Stay Ahead of the Next One
Get instant alerts for python software foundation cpython
Be the first to know when new unknown vulnerabilities affecting python software foundation cpython are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
Affected Versions
Python Software Foundation / CPython
0 < 3.10.17 3.11.0 < 3.11.12 3.12.0 < 3.12.9 3.13.0 < 3.13.2 3.14.0a1 < 3.14.0a5
References
github.com: https://github.com/python/cpython/issues/105704 github.com: https://github.com/python/cpython/pull/129418 mail.python.org: https://mail.python.org/archives/list/[email protected]/thread/K4EUG6EKV6JYFIC24BASYOZS4M5XOQIB/ github.com: https://github.com/python/cpython/commit/d89a5f6a6e65511a5f6e0618c4c30a7aa5aba56a github.com: https://github.com/python/cpython/commit/90e526ae67b172ed7c6c56e7edad36263b0f9403 github.com: https://github.com/python/cpython/commit/a7084f6075c9595ba60119ce8c62f1496f50c568 github.com: https://github.com/python/cpython/commit/526617ed68cde460236c973e5d0a8bad4de896ba github.com: https://github.com/python/cpython/commit/b8b4b713c5f8ec0958c7ef8d29d6711889bc94ab github.com: https://github.com/python/cpython/commit/ff4e5c25666f63544071a6b075ae8b25c98b7a32 security.netapp.com: https://security.netapp.com/advisory/ntap-20250314-0002/ lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/03/msg00013.html