High severity · published Feb 3, 2026
CVE-2025-14550
Potential denial-of-service vulnerability via repeated headers when using ASGI
7.5
CVSS
1.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 66% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DJ
Django · djangoproject
6.0 before 6.0.2; 5.2 before 5.2.11; 4.2 before 4.2.28 · source: vendor, NVD
AS
asgiref · djangoproject
3 before 3.11.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-14550
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-14550
Patch
https://docs.djangoproject.com/en/dev/releases/security/
Release Notes
https://groups.google.com/g/django-announce
Patch
https://www.djangoproject.com/weblog/2026/feb/03/security-releases/