Vulnerability in Djangoproject Django
CVE-2026-5766
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.005 (42.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Djangoproject Django — versions 6.0, 6.0.5, 5.2
Weakness classification (CWE)
References
- 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (vendor-advisory, Vendor Advisory)
- 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (mailing-list, Third Party Advisory)
- 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-5766?
- CVE-2026-5766 is a medium-severity vulnerability in Djangoproject Django, classified under Improper Handling of Length Parameter Inconsistency. CVSS score: 5.3/10. Published 2026-05-05.
- How severe is CVE-2026-5766?
- Medium severity. CVSS v3 base score is 5.3 out of 10.