USN-7855-1 partially fixed a regression issue in Unbound, which Ubuntu Security Notice USN-7855-2 addresses. The regression could lead to domain hijack attacks if an attacker exploited it. To resolve this issue, users need to update their system to the specified package versions for their Ubuntu release. Separately, Ubuntu Security Notice USN-7903-1 addresses several vulnerabilities in Django, including one that allowed arbitrary SQL commands and another that caused a denial of service due to inefficient deserialization of XML objects. The affected releases include multiple long-term support (LTS) versions of Ubuntu, with update instructions provided for each release.

[USN-7855-2] Unbound regression
[USN-7903-1] Django vulnerabilities

[USN-7855-2] Unbound regression

==========================================================================
Ubuntu Security Notice USN-7855-2
December 02, 2025

unbound regression
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

USN-7855-1 introduced a regression in Unbound

Software Description:
- unbound: validating, recursive, caching DNS resolver

Details:

USN-7855-1 fixed vulnerabilities in Unbound. It was discovered that the fix
for CVE-2025-11411 was incomplete. This update fixes the problem.

Original advisory details:

Yuxiao Wu, Yunyi Zhang, Baojun Liu, and Haixin Duan discovered that
Unbound incorrectly handled certain promiscuous NS RRSets. A remote
attacker could possibly use this issue to perform a domain hijack attack.

Update instructions:

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

Ubuntu 25.10
libunbound8 1.22.0-2ubuntu2.2
unbound 1.22.0-2ubuntu2.2

Ubuntu 25.04
libunbound8 1.22.0-1ubuntu1.3
unbound 1.22.0-1ubuntu1.3

Ubuntu 24.04 LTS
libunbound8 1.19.2-1ubuntu3.7
unbound 1.19.2-1ubuntu3.7

Ubuntu 22.04 LTS
libunbound8 1.13.1-1ubuntu5.14
unbound 1.13.1-1ubuntu5.14

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

References:
https://ubuntu.com/security/notices/USN-7855-2
https://ubuntu.com/security/notices/USN-7855-1
CVE-2025-11411, https://launchpad.net/bugs/2133715

Package Information:
https://launchpad.net/ubuntu/+source/unbound/1.22.0-2ubuntu2.2
https://launchpad.net/ubuntu/+source/unbound/1.22.0-1ubuntu1.3
https://launchpad.net/ubuntu/+source/unbound/1.19.2-1ubuntu3.7
https://launchpad.net/ubuntu/+source/unbound/1.13.1-1ubuntu5.14

[USN-7903-1] Django vulnerabilities

==========================================================================
Ubuntu Security Notice USN-7903-1
December 02, 2025

python-django vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- 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:

It was discovered that Django incorrectly handled certain characters in the
FilteredRelation object. An attacker could possibly use this issue to
execute arbitrary SQL commands. This issue only affected Ubuntu 20.04 LTS,
Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 25.04, and Ubuntu 25.10.
(CVE-2025-13372)

Seokchan Yoon discovered that Django inefficiently handled deserialization
of XML objects. An attacker could possibly use this issue to cause Django
to use excessive resources, causing a denial of service. (CVE-2025-64460)

Update instructions:

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

Ubuntu 25.10
python3-django 3:5.2.4-1ubuntu2.2

Ubuntu 25.04
python3-django 3:4.2.18-1ubuntu1.7

Ubuntu 24.04 LTS
python3-django 3:4.2.11-1ubuntu1.13

Ubuntu 22.04 LTS
python3-django 2:3.2.12-2ubuntu1.24

Ubuntu 20.04 LTS
python3-django 2:2.2.12-1ubuntu0.29+esm6
Available with Ubuntu Pro

Ubuntu 18.04 LTS
python-django 1:1.11.11-1ubuntu1.21+esm13
Available with Ubuntu Pro
python3-django 1:1.11.11-1ubuntu1.21+esm13
Available with Ubuntu Pro

Ubuntu 16.04 LTS
python-django 1.8.7-1ubuntu5.15+esm10
Available with Ubuntu Pro
python3-django 1.8.7-1ubuntu5.15+esm10
Available with Ubuntu Pro

Ubuntu 14.04 LTS
python-django 1.6.11-0ubuntu1.3+esm9
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-7903-1
CVE-2025-13372, CVE-2025-64460

Package Information:
https://launchpad.net/ubuntu/+source/python-django/3:5.2.4-1ubuntu2.2
https://launchpad.net/ubuntu/+source/python-django/3:4.2.18-1ubuntu1.7
https://launchpad.net/ubuntu/+source/python-django/3:4.2.11-1ubuntu1.13
https://launchpad.net/ubuntu/+source/python-django/2:3.2.12-2ubuntu1.24