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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 Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.5.0b1
Not yet released 		Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.4.0p22
Not yet released 		Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.3.0p43
Not yet released 		Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

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.

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