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Ubuntu Security Notice USN-8154-1
April 07, 2026

python-django vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in Django.

Software Description:
- python-django: High-level Python web development framework

Details:

Seokchan Yoon discovered that Django incorrectly handled copying memory
when parsing multipart uploads with excessive whitespace. A remote attacker
could possibly use this issue to cause Django to use excessive resources,
leading to a denial of service. (CVE-2026-33033)

It was discovered that Django did not enforce an upload memory size limit
in the Content-Length header. A remote attacker could possibly use this
issue to cause Django to use excessive resources, leading to a denial of
service. This issue only affected Ubuntu 24.04 LTS and Ubuntu 25.10.
(CVE-2026-33034)

Tarek Nakkouch discovered that Django incorrectly handled underscores in
the ASGI headers. A remote attacker could possibly use this issue to spoof
HTTP headers. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS,
and Ubuntu 25.10. (CVE-2026-3902)

It was discovered that Django incorrectly handled verification of model
data created with POST requests. A remote attacker could possibly use this
issue to forge new model permissions. (CVE-2026-4277, CVE-2026-4292)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
  python3-django                  3:5.2.4-1ubuntu2.4

Ubuntu 24.04 LTS
  python3-django                  3:4.2.11-1ubuntu1.15

Ubuntu 22.04 LTS
  python3-django                  2:3.2.12-2ubuntu1.26

Ubuntu 20.04 LTS
  python3-django                  2:2.2.12-1ubuntu0.29+esm8
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  python-django                   1:1.11.11-1ubuntu1.21+esm15
                                  Available with Ubuntu Pro
  python3-django                  1:1.11.11-1ubuntu1.21+esm15
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-8154-1
  CVE-2026-33033, CVE-2026-33034, CVE-2026-3902, CVE-2026-4277,
  CVE-2026-4292

Package Information:
  https://launchpad.net/ubuntu/+source/python-django/3:5.2.4-1ubuntu2.4
  https://launchpad.net/ubuntu/+source/python-django/3:4.2.11-1ubuntu1.15
  https://launchpad.net/ubuntu/+source/python-django/2:3.2.12-2ubuntu1.26