CVE-2025-14550

Potential denial-of-service vulnerability via repeated headers when using ASGI

State: Published
Severity: 7.5 High
Published: Feb 3, 2026
Updated: Feb 3, 2026
Reserved: Dec 11, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-407 Inefficient Algorithmic Complexity

Affected Products

Product	Versions
Djangodjangoproject	6.0 to before 6.0.2Affected 6.0.2Not affected 5.2 to before 5.2.11Affected 5.2.11Not affected 4.2 to before 4.2.28Affected 4.2.28Not affected
asgirefdjangoproject	3 to before 3.11.1Affected 3.11.1Not affected

References

Django security archivevendor-advisory
Django releases announcementsmailing-list
Django security releases issued: 6.0.2, 5.2.11, and 4.2.28vendor-advisory

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