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Ubuntu Security Notice USN-8154-2
April 09, 2026

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

- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Django.

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

Details:

USN-8154-1 fixed vulnerabilities in Django. This update provides the
corresponding updates for CVE-2026-33033 and CVE-2026-4292 in Ubuntu 14.04
LTS and Ubuntu 16.04 LTS, and CVE-2026-4277 in Ubuntu 16.04 LTS.

Original advisory 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 16.04 LTS
  python-django                   1.8.7-1ubuntu5.15+esm12
                                  Available with Ubuntu Pro
  python3-django                  1.8.7-1ubuntu5.15+esm12
                                  Available with Ubuntu Pro

Ubuntu 14.04 LTS
  python-django                   1.6.11-0ubuntu1.3+esm11
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-8154-2
  https://ubuntu.com/security/notices/USN-8154-1
  CVE-2026-33033, CVE-2026-4277, CVE-2026-4292