USN-7838-1: fetchmail vulnerability

Publication date

23 October 2025

Overview

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


Packages

  • 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.

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
25.04 plucky fetchmail –  6.4.39-1ubuntu0.1
24.04 LTS noble fetchmail –  6.4.38-1ubuntu4.1
22.04 LTS jammy fetchmail –  6.4.27-1ubuntu0.1

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