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[USN-8369-1] Apache Tomcat Connectors vulnerability

Posted on 02 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8369-1
June 02, 2026

libapache-mod-jk vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Apache Tomcat Connectors could allow local users to expose sensitive
information or cause a denial of service.

Software Description:
- libapache-mod-jk: Apache 2 connector for the Tomcat Java servlet engine

Details:

It was discovered that Apache Tomcat Connectors used incorrect default
permissions for shared memory on Unix-like systems. A local attacker
could possibly use this issue to view or modify mod_jk configuration
data in shared memory, resulting in sensitive information exposure or a
denial of service.

Update instructions:

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

Ubuntu 24.04 LTS
libapache2-mod-jk 1:1.2.49-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 22.04 LTS
libapache2-mod-jk 1:1.2.48-1ubuntu0.1+esm1
Available with Ubuntu Pro

Ubuntu 20.04 LTS
libapache2-mod-jk 1:1.2.46-1ubuntu0.1+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libapache2-mod-jk 1:1.2.43-1ubuntu0.1~esm2
Available with Ubuntu Pro

Ubuntu 16.04 LTS
libapache2-mod-jk 1:1.2.41-1ubuntu0.1~esm1
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8369-1
CVE-2024-46544

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