Medium severity · published May 5, 2026
CVE-2026-5766
Potential denial-of-service vulnerability in ASGI requests via file upload limit bypass
5.3
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DJ
Django · djangoproject
6.0 before 6.0.5; 5.2 before 5.2.14 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5766
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-5766
Vendor Advisory
https://docs.djangoproject.com/en/dev/releases/security/
Third Party Advisory
https://groups.google.com/g/django-announce
Vendor Advisory
https://www.djangoproject.com/weblog/2026/may/05/security-releases/
More from Django
9.8
CVE-2026-4277
Privilege abuse in GenericInlineModelAdmin
9.8
CVE-2025-59681
An issue was discovered in Django 4.2 before 4.2.25, 5.1 before 5.1.13, and 5.2 before 5.2.7
9.8
CVE-2024-53908
An issue was discovered in Django 5.1 before 5.1.4, 5.0 before 5.0.10, and 4.2 before 4.2.17
9.8
CVE-2023-31047
In Django 3.2 before 3.2.19, 4.x before 4.1.9, and 4.2 before 4.2.1, it was possible to bypass validation when using one form field to upload multiple files
9.8
CVE-2022-34265
An issue was discovered in Django 3.2 before 3.2.14 and 4.0 before 4.0.6