Werk #19052: Reject non-UTF-8 input from Nagios command pipe

Component

The Checkmk Micro Core

Title

Reject non-UTF-8 input from Nagios command pipe

Date

Feb 19, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.6.0b1 Not yet released	Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT
2.5.0b1	Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT
2.4.0p22	Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT
2.3.0p43	Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

Invalid non-UTF-8 input from the Nagios command pipe can result in a corrupt CMC state file. Werk #14949 already fixed a similar issue for Livestatus input or check output, but missed the validation of the Nagios command pipe input. This has been fixed.

To the list of all Werks