URL parser allowed square brackets in domain names

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-0938
StatePUBLISHED
AssignerPSF
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-01-31 18:15:38 UTC
Updated2026-07-31 14:16:42 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v4.0 6.3 MEDIUM from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.015250000 probability, percentile 0.721750000 (date 2026-08-03)

Problem Types: CWE-20 | CWE-20 CWE-20 Improper Input Validation

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary6.3MEDIUMCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/C...
4.0CNACVSS6.3MEDIUMCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Sub Conf.
None
Sub Integrity
Low
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Python Software Foundation CPython affected 3.9.22 python Not specified
CNA Python Software Foundation CPython affected 3.10.0 3.10.17 python Not specified
CNA Python Software Foundation CPython affected 3.11.0 3.11.12 python Not specified
CNA Python Software Foundation CPython affected 3.12.0 3.12.9 python Not specified
CNA Python Software Foundation CPython affected 3.13.0 3.13.2 python Not specified
CNA Python Software Foundation CPython affected 3.14.0a1 3.14.0a5 python Not specified

References

ReferenceSourceLinkTags
github.com/python/cpython/commit/526617ed68cde460236c973e5d0a8bad4de896ba [email protected] github.com
github.com/python/cpython/commit/d89a5f6a6e65511a5f6e0618c4c30a7aa5aba56a [email protected] github.com
github.com/python/cpython/commit/ff4e5c25666f63544071a6b075ae8b25c98b7a32 [email protected] github.com
security.netapp.com/advisory/ntap-20250314-0002 af854a3a-2127-422b-91ae-364da2661108 security.netapp.com
lists.debian.org/debian-lts-announce/2025/03/msg00013.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
github.com/python/cpython/issues/105704 [email protected] github.com
github.com/python/cpython/commit/90e526ae67b172ed7c6c56e7edad36263b0f9403 [email protected] github.com
github.com/python/cpython/commit/b8b4b713c5f8ec0958c7ef8d29d6711889bc94ab [email protected] github.com
github.com/python/cpython/commit/a7084f6075c9595ba60119ce8c62f1496f50c568 [email protected] github.com
github.com/python/cpython/pull/129418 [email protected] github.com
mail.python.org/archives/list/[email protected]/thread/K4EUG6EKV6J... [email protected] mail.python.org
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