CVE-2025-0938: Libpython · URL parser allowed square brackets in domain names
Affects libpythonSource GCVE Database
Not known to be exploited · fixed in 3.13.2 : update libpython when convenient.
Data as of 4 Nov 2026, 17:16 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- Patch
- Available – fixed in 3.13.2, 3.12.9, 3.11.12 +2
Exploitation evidence
Disclosed: evidence found.
CVE published 11 Aug 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 4 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Bitnamilibpythonpkg:bitnami/libpythonOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
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.
References
- github.com/python/cpython/commit/526617ed68cde460236c973e5d0a8bad4de896ba (opens in a new tab)
- github.com/python/cpython/commit/90e526ae67b172ed7c6c56e7edad36263b0f9403 (opens in a new tab)
- github.com/python/cpython/commit/a7084f6075c9595ba60119ce8c62f1496f50c568 (opens in a new tab)
- github.com/python/cpython/commit/b8b4b713c5f8ec0958c7ef8d29d6711889bc94ab (opens in a new tab)
- github.com/python/cpython/commit/d89a5f6a6e65511a5f6e0618c4c30a7aa5aba56a (opens in a new tab)
- github.com/python/cpython/commit/ff4e5c25666f63544071a6b075ae8b25c98b7a32 (opens in a new tab)
- github.com/python/cpython/issues/105704 (opens in a new tab)
- github.com/python/cpython/pull/129418 (opens in a new tab)
- mail.python.org/archives/list/security-announce@python.org/thread/K4EUG6EKV6JYFIC24BASYOZS4M5XOQIB/ (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2025-0938 (opens in a new tab)
- security.netapp.com/advisory/ntap-20250314-0002/ (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/03/msg00013.html (opens in a new tab)