Werk #18582: Fix negation in REST API Livestatus queries

Component

REST API

Title

Fix negation in REST API Livestatus queries

Date

Mar 25, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

3.0.0b1 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.5.0b3	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.4.0p26	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Negated Livestatus queries built via the cmk.livestatus_client Python module generated an invalid Negate: 1 header instead of the correct Negate: header (without an argument), which could lead to unexpected query results.

REST API endpoints that accept user-defined Livestatus queries were also affected, as they use this client internally.

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