Werk #18559: Fix crash in APC NetShelter PDU monitoring caused by null-padded SNMP names

Component

Checks & agents

Title

Fix crash in APC NetShelter PDU monitoring caused by null-padded SNMP names

Date

Jun 3, 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
2.5.0p6	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Some APC NetShelter Advanced Rack PDUs (APDU series) report their bank, device and outlet names as fixed-width, null-terminated strings over SNMP (e.g. "B6\x00" instead of "B6"). Previously, these null bytes were used verbatim in the service item and propagated into the RRD specification, crashing RRD info-file creation.

Bank, device and outlet names are now sanitized before use, so monitoring these PDUs works correctly.

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