Bug 2466776 (CVE-2026-5766) - CVE-2026-5766 django: Django: Service degradation via understated Content-Length header in ASGI requests
Summary: CVE-2026-5766 django: Django: Service degradation via understated Content-Len...
Keywords:
Status: NEW
Alias: CVE-2026-5766
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2484687
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-05 17:01 UTC by OSIDB Bzimport
Modified: 2026-07-18 08:29 UTC (History)
45 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-05-05 17:01:59 UTC
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.


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