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[USN-8270-1] Exim vulnerability

Posted on 12 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8270-1
May 12, 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 crash or run programs if it received specially
crafted network traffic.

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

Details:

It was discovered that Exim incorrectly handled BDAT body parsing. A remote
attacker could use this issue to cause Exim to crash, resulting in a denial
of service, or possibly execute arbitrary code.

Update instructions:

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

Ubuntu 26.04 LTS
exim4 4.99.1-1ubuntu1.2
exim4-base 4.99.1-1ubuntu1.2
eximon4 4.99.1-1ubuntu1.2

Ubuntu 25.10
exim4 4.98.2-1ubuntu2.2
exim4-base 4.98.2-1ubuntu2.2
eximon4 4.98.2-1ubuntu2.2

Ubuntu 24.04 LTS
exim4 4.97-4ubuntu4.5
exim4-base 4.97-4ubuntu4.5
eximon4 4.97-4ubuntu4.5

Ubuntu 22.04 LTS
exim4 4.95-4ubuntu2.8
exim4-base 4.95-4ubuntu2.8
eximon4 4.95-4ubuntu2.8

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

References:
https://ubuntu.com/security/notices/USN-8270-1
https://launchpad.net/bugs/2152202

Package Information:
https://launchpad.net/ubuntu/+source/exim4/4.99.1-1ubuntu1.2
https://launchpad.net/ubuntu/+source/exim4/4.98.2-1ubuntu2.2
https://launchpad.net/ubuntu/+source/exim4/4.97-4ubuntu4.5
https://launchpad.net/ubuntu/+source/exim4/4.95-4ubuntu2.8

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