Django ASGIRequest DoS via Duplicate Headers <6.0.2, 5.2.11, 4.2.28
CVE-2025-14550 Published on February 3, 2026
Potential denial-of-service vulnerability via repeated headers when using ASGI
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.
Vulnerability Analysis
CVE-2025-14550 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Timeline
Initial report received.
Vulnerability confirmed. 32 days later.
Security release issued. 49 days later.
Weakness Type
Inefficient Algorithmic Complexity
An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.
Products Associated with CVE-2025-14550
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Affected Versions
djangoproject Django:- Version 6.0 and below 6.0.2 is affected.
- Version 6.0.2 is unaffected.
- Version 5.2 and below 5.2.11 is affected.
- Version 5.2.11 is unaffected.
- Version 4.2 and below 4.2.28 is affected.
- Version 4.2.28 is unaffected.
- Version 3 and below 3.11.1 is affected.
- Version 3.11.1 is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.