Vulnerability · Published Feb 3, 2026 · Assigned by DSF
CVE-2025-14550Potential denial-of-service vulnerability via repeated headers when using ASGI
High 7.5
In plain English
A high-severity security flaw in asgiref from djangoproject. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | py3-django | 4.2.28-r0 | ALPINE-CVE-2025-14550 |
| Alpine:v3.24 | py3-django | 4.2.28-r0 | ALPINE-CVE-2025-14550 |
| Debian:12 | python-django | 3:3.2.25-0+deb12u2 | DEBIAN-CVE-2025-14550 |
| Debian:12 | python-django | 3:3.2.25-0+deb12u2 | DSA-6150-1 |
| Debian:13 | python-django | 3:4.2.28-0+deb13u1 | DEBIAN-CVE-2025-14550 |
| Debian:13 | python-django | 3:4.2.28-0+deb13u1 | DSA-6150-1 |
| Debian:14 | python-django | 3:4.2.28-1 | DEBIAN-CVE-2025-14550 |
| PyPI | django | 5.2.11 | GHSA-33mw-q7rj-mjwj |
| PyPI | django | 6.0.2 | GHSA-33mw-q7rj-mjwj |
| PyPI | django | 4.2.28 | GHSA-33mw-q7rj-mjwj |
| PyPI | django | 4.2.28, 5.2.11, 6.0.2 | PYSEC-2026-43 |
| Ubuntu:22.04:LTS | python-django | 2:3.2.12-2ubuntu1.25 | UBUNTU-CVE-2025-14550 |
| Ubuntu:24.04:LTS | python-django | 3:4.2.11-1ubuntu1.14 | UBUNTU-CVE-2025-14550 |
| Ubuntu:25.10 | python-django | 3:5.2.4-1ubuntu2.3 | UBUNTU-CVE-2025-14550 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| djangoproject | Django | 6.0 – before 6.0.25.2 – before 5.2.114.2 – before 4.2.28 |
| djangoproject | asgiref | 3 – before 3.11.1 |
Weakness: CWE-407 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- Django security archive vendor-advisory
- Django releases announcements mailing-list
- Django security releases issued: 6.0.2, 5.2.11, and 4.2.28 vendor-advisory