CVE-2026-5766 — Potential denial-of-service vulnerability in ASGI requests via file upload limit bypass

Affected: djangoproject Django

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.

USN-8232-1 — python-django vulnerabilities

Affected: Ubuntu:22.04:LTS: python-django, Ubuntu:24.04:LTS: python-django, Ubuntu:25.10: python-django, Ubuntu:26.04:LTS: python-django

It was discovered that Django did not vary cached response headers on cookies when sessions were not modified while SESSION_SAVE_EVERY_REQUEST was enabled. A remote attacker could possibly use this issue to steal a user's session. (CVE-2026-35192)

Kyle Agronick and Jacob Walls discovered that Django incorrectly handled ASGI requests with missing or understated Content-Length header values. A remote attacker could possibly use this issue to cause Django to use excessive resources, leading to a denial of service. (CVE-2026-5766)

Ahmad Sadeddin discovered that Django UpdateCacheMiddleware incorrectly cached requests where the Vary header contained an asterisk. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-6907)

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CVE-2026-5766 — Potential denial-of-service vulnerability in ASGI requests via file upload limit bypass

USN-8232-1 — python-django vulnerabilities