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[USN-8353-1] Exim vulnerability

Posted on 01 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8353-1
June 01, 2026

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

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Exim could be made to expose sensitive information over the network.

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

Details:

Warisjeet Singh discovered that Exim with SUPPORT_PROXY enabled did not
properly handle memory before SMTP authentication. A remote attacker could
possibly use this issue to obtain sensitive information.

Update instructions:

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

Ubuntu 26.04 LTS
exim4 4.99.1-1ubuntu1.3
exim4-base 4.99.1-1ubuntu1.3
eximon4 4.99.1-1ubuntu1.3

Ubuntu 25.10
exim4 4.98.2-1ubuntu2.3
exim4-base 4.98.2-1ubuntu2.3
eximon4 4.98.2-1ubuntu2.3

Ubuntu 24.04 LTS
exim4 4.97-4ubuntu4.6
exim4-base 4.97-4ubuntu4.6
eximon4 4.97-4ubuntu4.6

Ubuntu 22.04 LTS
exim4 4.95-4ubuntu2.9
exim4-base 4.95-4ubuntu2.9
eximon4 4.95-4ubuntu2.9

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

References:
https://ubuntu.com/security/notices/USN-8353-1
CVE-2026-48840

Package Information:
https://launchpad.net/ubuntu/+source/exim4/4.99.1-1ubuntu1.3
https://launchpad.net/ubuntu/+source/exim4/4.98.2-1ubuntu2.3
https://launchpad.net/ubuntu/+source/exim4/4.97-4ubuntu4.6
https://launchpad.net/ubuntu/+source/exim4/4.95-4ubuntu2.9

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