Django Improper Handling of Length Parameter Inconsistency Vulnerability - 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.