Vulnerability · Published May 5, 2026 · Assigned by DSF
CVE-2026-5766Potential denial-of-service vulnerability in ASGI requests via file upload limit bypass
Medium 5.3
In plain English
A medium-severity security flaw in Django from djangoproject. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
An issue was discovered in 6.0 before 6.0.5 and 5.2 before 5.2.14. ASGI requests with a missing or understated `Content-Length` header can bypass the `FILE_UPLOAD_MAX_MEMORY_SIZE` limit, potentially loading large files into memory and causing service degradation. As a reminder, Django expects a limit to be configured at the web server level rather than solely relying on `FILE_UPLOAD_MAX_MEMORY_SIZE`. 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 Kyle Agronick for reporting this issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | py3-django | 5.2.14-r0 | ALPINE-CVE-2026-5766 |
| Debian:12 | python-django | no fix listed | DEBIAN-CVE-2026-5766 |
| Debian:13 | python-django | no fix listed | DEBIAN-CVE-2026-5766 |
| Debian:14 | python-django | 3:5.2.14-1 | DEBIAN-CVE-2026-5766 |
| PyPI | django | 6.0.5 | GHSA-w26r-rmm8-9c29 |
| PyPI | django | 5.2.14 | GHSA-w26r-rmm8-9c29 |
| PyPI | django | 5.2.14, 6.0.5 | PYSEC-2026-54 |
| Ubuntu:22.04:LTS | python-django | 2:3.2.12-2ubuntu1.27 | UBUNTU-CVE-2026-5766 |
| Ubuntu:24.04:LTS | python-django | 3:4.2.11-1ubuntu1.16 | UBUNTU-CVE-2026-5766 |
| Ubuntu:25.10 | python-django | 3:5.2.4-1ubuntu2.5 | UBUNTU-CVE-2026-5766 |
| Ubuntu:26.04:LTS | python-django | 3:5.2.9-0ubuntu4.1 | UBUNTU-CVE-2026-5766 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| djangoproject | Django | 6.0 – before 6.0.55.2 – before 5.2.14 |
Weakness: CWE-130 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References
- Django security archive vendor-advisory
- Django releases announcements mailing-list
- Django security releases issued: 6.0.5 and 5.2.14 vendor-advisory