CVE-2025-09386.3MediumCWE-20

CVE-2025-0938: URL parser allowed square brackets in domain names

Python Software Foundation · CPython

Vendor fix available · Affected: Python Software Foundation CPython · Exploitation: possible (1 to 10%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

1.6%probability of exploitation in the next 30 days

75th percentile

050100

Higher than 75% of scored CVEs

6.3MediumCVSS 4.0

LowMediumHighCrit.

DescriptionCVE.org

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.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Python Software Foundation · CPythonbefore 3.9.22; from 3.10.0 before 3.10.17; from 3.11.0 before 3.11.12; from 3.12.0 before 3.12.9; from 3.13.0 before 3.13.2; from 3.14.0a1 before 3.14.0a5

On the Atlas

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Open the Atlas

Exploitation: Possible (1 to 10%). EPSS between 1% and 10%.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Improper Input Validation · Input Validation and Logic
Vendor: Python Software Foundation
Published: January 2025
Band: Possible (1 to 10%), January 2025

CoverageNo articles yet

No CyberSIXT article names CVE-2025-0938 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.