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[USN-8590-1] Exim vulnerabilities

Posted on 22 July 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8590-1
July 22, 2026

exim4 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in Exim.

Software Description:
- exim4: Exim is a mail transport agent

Details:

It was discovered that Exim incorrectly handled certain command line
options. A local attacker could possibly use this issue to access files
outside of the spool area.

It was discovered that Exim incorrectly handled string expansion in
.local files. A local attacker could possibly use this issue to escalate
privileges.

Update instructions:

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

Ubuntu 26.04 LTS
exim4 4.99.1-1ubuntu1.4

Ubuntu 24.04 LTS
exim4 4.97-4ubuntu4.7

Ubuntu 22.04 LTS
exim4 4.95-4ubuntu2.11

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

References:
https://ubuntu.com/security/notices/USN-8590-1
https://launchpad.net/bugs/2161106

Package Information:
https://launchpad.net/ubuntu/+source/exim4/4.99.1-1ubuntu1.4
https://launchpad.net/ubuntu/+source/exim4/4.97-4ubuntu4.7
https://launchpad.net/ubuntu/+source/exim4/4.95-4ubuntu2.11

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