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Fencer Vulns
high 7.5

CVE-2026-33034 json

Potential denial-of-service vulnerability in ASGI requests via memory upload limit bypass

published 2026-04-07 7 mo ago modified 2026-10-26 13 d ago also BIT-django-2026-33034 , EUVD-2026-19648 , GHSA-933h-hp56-hf7m , PYSEC-2026-49

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi django 4.2.30, 5.2.13, 6.0.4
  • bitnami django 4.2.30, 5.2.13, 6.0.4
  • djangoproject Django 4.2.30, 5.2.13, 6.0.4
  • python-django Debian 14 3:4.2.30-1

debian advisories DEBIAN-CVE-2026-33034

  • python-django Ubuntu 24.04 LTS 3:4.2.11-1ubuntu1.15
  • python-django Ubuntu 25.10 3:5.2.4-1ubuntu2.4

ubuntu advisories UBUNTU-CVE-2026-33034

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python-Django5 openSUSE Tumbleweed 5.2.16-1.1
  • python-Django openSUSE Tumbleweed 5.2.13-1.1
  • python-Django openSUSE Leap 16.0 5.2.4-bp160.7.1
  • python-Django4 openSUSE Tumbleweed 4.2.30-1.1
  • python-Django6 openSUSE Tumbleweed 6.0.4-1.1

opensuse advisories openSUSE-SU-2026:11270-1openSUSE-SU-2026:10567-1openSUSE-SU-2026:20578-1openSUSE-SU-2026:10516-1openSUSE-SU-2026:10517-1

  • py3-django Alpine 3.23 4.2.30-r0
  • py3-django Alpine 3.24 5.2.13-r0

alpine advisories ALPINE-CVE-2026-33034

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-33034 updated cvss 5.3

Django: Django: Denial of Service via missing or understated Content-Length header in ASGI requests

  • Red Hat Ansible Automation Platform 2 automation-controller, redhat-user-workloads/es-team-tenant/automation-reports, ansible-automation-platform-24/lightspeed-rhel8-operator, ansible-automation-platform-26/lightspeed-rhel9-operator, redhat-user-workloads/ansible-tenant/ansible-automation-platform-26/hub-rhel9, redhat-user-workloads/ansible-tenant/ansible-automation-platform-26/gateway-rhel9, +3 more Red Hat Discovery 2 redhat-user-workloads/discovery-tenant/discovery/discovery-server Red Hat Satellite 6 redhat-user-workloads/insights-management-tenant/satellite-iop/iop-advisor-backend-sat-6-18
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.80% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi django
>=6.0, <6.0.4
>=5.2, <5.2.13
>=4.2, <4.2.30
6.0.4
5.2.13
4.2.30
bitnami django
>=4.2.0, <4.2.30
>=5.2.0, <5.2.13
>=6.0.0, <6.0.4
4.2.30
5.2.13
6.0.4

Affected products

  • djangoproject Django

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.