Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-25673— Potential denial-of-service vulnerability in URLField via Unicode normalization on Windows

Quick assessment

Affected
djangoproject Django
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Django是Django基金会的一套基于Python语言的开源Web应用框架。该框架包括面向对象的映射器、视图系统、模板系统等。 Django 6.0.3之前版本、5.2.12之前版本和4.2.29之前版本存在安全漏洞，该漏洞源于URLField.to_python函数调用urllib.parse.urlsplit时，在Windows上对某些Unicode字符执行NFKC归一化操作速度过慢，可能导致远程攻击者通过包含这些字符的大量URL输入造成拒绝服务。

AI Predicted 7.5 Difficulty: Trivial EPSS 1.14% · P66

Affected Version Matrix 6

VendorProduct Version RangeStatus
djangoproject Django 6.0< 6.0.3 affected
6.0.3 unaffected
5.2< 5.2.12 affected
5.2.12 unaffected
4.2< 4.2.29 affected
4.2.29 unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-25673

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Potential denial-of-service vulnerability in URLField via Unicode normalization on Windows
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Django 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Django是Django基金会的一套基于Python语言的开源Web应用框架。该框架包括面向对象的映射器、视图系统、模板系统等。 Django 6.0.3之前版本、5.2.12之前版本和4.2.29之前版本存在安全漏洞，该漏洞源于URLField.to_python函数调用urllib.parse.urlsplit时，在Windows上对某些Unicode字符执行NFKC归一化操作速度过慢，可能导致远程攻击者通过包含这些字符的大量URL输入造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
djangoproject Django 6.0 ~ 6.0.3 -

II. Public POCs for CVE-2026-25673

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-25673

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-25673 (1)

Mailing List Discussions for CVE-2026-25673 (1)

Security Blog Posts for CVE-2026-25673 (1)

IV. Related Vulnerabilities

Same product: Django
Same vendor: djangoproject
Same weakness: CWE-400

V. Comments for CVE-2026-25673

No comments yet

Leave a comment