CVE-2026-33034: Django 4.2-6.0 b4 upload size limit bypass (ASGI)
CVE-2026-33034 Published on April 7, 2026
Potential denial-of-service vulnerability in ASGI requests via memory upload limit bypass
An issue was discovered in 6.0 before 6.0.4, 5.2 before 5.2.13, and 4.2 before 4.2.30.
ASGI requests with a missing or understated `Content-Length` header could
bypass the `DATA_UPLOAD_MAX_MEMORY_SIZE` limit when reading
`HttpRequest.body`, allowing remote attackers to load an unbounded request body into
memory.
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 Superior for reporting this issue.
Vulnerability Analysis
CVE-2026-33034 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Timeline
Initial report received.
Vulnerability confirmed. 21 days later.
Security release issued. 21 days later.
Weakness Type
Allocation of Resources Without Limits or Throttling
The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
Products Associated with CVE-2026-33034
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Affected Versions
djangoproject Django:- Version 6.0 and below 6.0.4 is affected.
- Version 6.0.4 is unaffected.
- Version 5.2 and below 5.2.13 is affected.
- Version 5.2.13 is unaffected.
- Version 4.2 and below 4.2.30 is affected.
- Version 4.2.30 is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.