What’s Vulnerable › Vulnerabilities

CVE-2025-14550: Potential denial-of-service vulnerability via repeated headers when using ASGI

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-03 · updated 2026-06-17
• Weakness: CWE-407

Description

An issue was discovered in 6.0 before 6.0.2, 5.2 before 5.2.11, and 4.2 before 4.2.28. `ASGIRequest` allows a remote attacker to cause a potential denial-of-service via a crafted request with multiple duplicate headers. 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 Jiyong Yang for reporting this issue.

Affected products

• Django: from 4.2 before 4.2.28; from 5.2 before 5.2.11; from 6.0 before 6.0.2 — fixed in 4.2.28, 5.2.11, 6.0.2

How to fix

Upgrade to a fixed version: Django 4.2.28, 5.2.11, 6.0.2. Check the vendor advisory for mitigations.

References

• https://docs.djangoproject.com/en/dev/releases/security/
• https://groups.google.com/g/django-announce
• https://www.djangoproject.com/weblog/2026/feb/03/security-releases/

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