Python
CVE-2026-25673
HIGH
GHSA-8p8v-wh79-9r56
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from Vendor (6a34fbeb-21d4-45e7-8e0a-62b95bc12c92).
CVSS VectorVendor: 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionCVE.org
An issue was discovered in 6.0 before 6.0.3, 5.2 before 5.2.12, and 4.2 before 4.2.29. URLField.to_python() in Django calls urllib.parse.urlsplit(), which performs NFKC normalization on Windows that is disproportionately slow for certain Unicode characters, allowing a remote attacker to cause denial of service via large URL inputs containing these characters. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Seokchan Yoon for reporting this issue.
AnalysisAI
Django URL field validation triggers excessive Unicode normalization on Windows when processing certain malicious Unicode characters, enabling remote attackers to cause denial of service through crafted URL inputs. Affected versions include Django 6.0 before 6.0.3, 5.2 before 5.2.12, and 4.2 before 4.2.29, with potential impact to unsupported series 5.0.x, 4.1.x, and 3.2.x. A patch is available for all affected supported versions.
Technical ContextAI
Classified as CWE-400 (Uncontrolled Resource Consumption). Affects Django. An issue was discovered in 6.0 before 6.0.3, 5.2 before 5.2.12, and 4.2 before 4.2.29. URLField.to_python() in Django calls urllib.parse.urlsplit(), which performs NFKC normalization on Windows that is disproportionately slow for certain Unicode characters, allowing a remote attacker to cause denial of service via large URL inputs containing these characters. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to
RemediationAI
A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
View allVendor StatusVendor
SUSE
Severity: High| Product | Status |
|---|---|
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | Fixed |
| openSUSE Leap 15.6 | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | Fixed |
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External POC / Exploit Code
Leaving vuln.today