Python
CVE-2026-25673
HIGH
GHSA-8p8v-wh79-9r56
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessCraft HTTP request with large URL
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DeliverySend URL containing slow-normalizing Unicode
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ExploitURLField.to_python() calls urllib.parse.urlsplit()
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ExecutionNFKC normalization consumes CPU
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ImpactDenial of service
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V2 - Validation and Business Logic Resource consumption limits
MITRE ATT&CK
1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Django 6.0 before 6.0.3, 5.2 before 5.2.12, or 4.2 before 4.2.29 running on Windows with URLField validation enabled. Remote unauthenticated attacker can exploit via HTTP request without authentication or user interaction. |
| Impact | CVSS 7.5 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Exploitable via remote/network. |
| Exploit ScenarioDerived | A remote attacker could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
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.
Earlier versions of this analysis (1)
An issue was discovered in 6.0 before 6.0.3, 5.2 before 5.2.12, and 4.2 before 4.2.29. [CVSS 7.5 HIGH]
RemediationAI
A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in pypi
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
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
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- Exploit and PoC references, threat intelligence from 22 sources
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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
Lifecycle Timeline
2DescriptionCVE.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.
Executive ViewAI
CVE-2026-25673 is a HIGH severity vulnerability affecting multiple versions of a critical system component, with a 7.5 CVSS score indicating significant risk to confidentiality, integrity, or availability. Organizations running versions 6.0 before 6.0.3, 5.2 before 5.2.12, or 4.2 before 4.2.29 require immediate patching to prevent potential exploitation and unauthorized system access.
Apply vendor patch.
Threat Intelligence Overview
NVD
CVE.org
EPSS
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)CVE.org
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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 |
Exploit-DB