CVE-2026-5766
Potential denial-of-service vulnerability in ASGI requests via file upload limit bypass
- State
- Published
- Severity
- 6.3 Medium
- Published
- May 5, 2026
- Updated
- May 6, 2026
- Reserved
- Apr 7, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | DSF |
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | DSF |
Weaknesses
- CWE-130 Improper Handling of Length Parameter Inconsistency
Affected Products
| Product | Versions |
|---|---|
Djangodjangoproject |
|
References
- Django security archivevendor-advisory
- Django releases announcementsmailing-list
- Django security releases issued: 6.0.5 and 5.2.14vendor-advisory
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