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[USN-7838-1] fetchmail vulnerability

Posted on 23 October 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7838-1
October 23, 2025

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

- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

fetchmail could be made to crash if it received specially crafted network
traffic.

Software Description:
- fetchmail: SSL enabled POP3, APOP, IMAP mail gatherer/forwarder

Details:

It was discovered that the fetchmail SMTP client incorrectly handled
certain status code messages. An attacker controlling a malicious server
could possibly use this issue to cause fetchmail to crash, resulting in a
denial of service.

Update instructions:

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

Ubuntu 25.04
fetchmail 6.4.39-1ubuntu0.1

Ubuntu 24.04 LTS
fetchmail 6.4.38-1ubuntu4.1

Ubuntu 22.04 LTS
fetchmail 6.4.27-1ubuntu0.1

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

References:
https://ubuntu.com/security/notices/USN-7838-1
CVE-2025-61962

Package Information:
https://launchpad.net/ubuntu/+source/fetchmail/6.4.39-1ubuntu0.1
https://launchpad.net/ubuntu/+source/fetchmail/6.4.38-1ubuntu4.1
https://launchpad.net/ubuntu/+source/fetchmail/6.4.27-1ubuntu0.1

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