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CVE-2026-33033— Potential denial-of-service vulnerability in MultiPartParser via base64-encoded file upload

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 6.0.4之前版本、5.2.13之前版本和4.2.30之前版本存在安全漏洞，该漏洞源于MultiPartParser允许远程攻击者通过提交包含过多空白字符的multipart上传来降低性能，可能导致拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.88% · P56

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-33033

Vulnerability Information
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Vulnerability Title
Potential denial-of-service vulnerability in MultiPartParser via base64-encoded file upload
Source: CVE Program / CVE List V5
Vulnerability Description
An issue was discovered in 6.0 before 6.0.4, 5.2 before 5.2.13, and 4.2 before 4.2.30. `MultiPartParser` allows remote attackers to degrade performance by submitting multipart uploads with `Content-Transfer-Encoding: base64` including excessive whitespace. 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 Seokchan Yoon for reporting this issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
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 6.0.4之前版本、5.2.13之前版本和4.2.30之前版本存在安全漏洞，该漏洞源于MultiPartParser允许远程攻击者通过提交包含过多空白字符的multipart上传来降低性能，可能导致拒绝服务。
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 ~ 6.0.4 -

II. Public POCs for CVE-2026-33033

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III. Intelligence Information for CVE-2026-33033

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Vendor Advisories for CVE-2026-33033 (2)

Mailing List Discussions for CVE-2026-33033 (1)

Same Patch Batch · djangoproject · 2026-04-07 · 5 CVEs total

CVE-2026-3902 ASGI header spoofing via underscore/hyphen conflation
CVE-2026-4292 Privilege abuse in ModelAdmin.list_editable
CVE-2026-4277 Privilege abuse in GenericInlineModelAdmin
CVE-2026-33034 Potential denial-of-service vulnerability in ASGI requests via memory upload limit bypass

IV. Related Vulnerabilities

Same product: Django
Same vendor: djangoproject
Same weakness: CWE-407

V. Comments for CVE-2026-33033

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