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

Quick assessment

Affected
djangoproject Django
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Django是Django基金会的一套基于Python语言的开源Web应用框架。该框架包括面向对象的映射器、视图系统、模板系统等。 Django 6.0.5之前版本和5.2.14之前版本存在安全漏洞，该漏洞源于ASGI请求缺少或低估Content-Length标头，可能绕过FILE_UPLOAD_MAX_MEMORY_SIZE限制，导致大文件加载到内存中并造成服务降级。

CVSS 5.3 · Medium EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
djangoproject Django 6.0< 6.0.5 affected
6.0.5 unaffected
5.2< 5.2.14 affected
5.2.14 unaffected
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I. Basic Information for CVE-2026-5766

Vulnerability Information
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Vulnerability Title
Potential denial-of-service vulnerability in ASGI requests via file upload limit bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
长度参数不一致性处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Django 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Django是Django基金会的一套基于Python语言的开源Web应用框架。该框架包括面向对象的映射器、视图系统、模板系统等。 Django 6.0.5之前版本和5.2.14之前版本存在安全漏洞，该漏洞源于ASGI请求缺少或低估Content-Length标头，可能绕过FILE_UPLOAD_MAX_MEMORY_SIZE限制，导致大文件加载到内存中并造成服务降级。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
djangoproject Django 6.0 ~ 6.0.5 -

II. Public POCs for CVE-2026-5766

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III. Intelligence Information for CVE-2026-5766

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Vendor Advisories for CVE-2026-5766 (1)

Mailing List Discussions for CVE-2026-5766 (1)

Security Blog Posts for CVE-2026-5766 (1)

Same Patch Batch · djangoproject · 2026-05-05 · 3 CVEs total

CVE-2026-6907 4.3 MEDIUM Potential exposure of private data due to incorrect handling of Vary: * in UpdateCacheMidd
CVE-2026-35192 Session fixation via public cached pages and SESSION_SAVE_EVERY_REQUEST

IV. Related Vulnerabilities

Same product: Django
Same vendor: djangoproject
Same weakness: CWE-130

V. Comments for CVE-2026-5766

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