Werk #16923: Parsing of section inv_lldp_cache failed

Component	Checks & agents
Title	Parsing of section inv_lldp_cache failed
Date	Jul 7, 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 2.5.0p9 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Some devices like the Cisco Nexus9000 report network addresses via SNMP whose byte sequence length does not match the announced address family, which resulted in crashes while parsing the SNMP tree. In particular, some IPv4 addresses are wrongly reported with the IPv6 address family.

This change validates the length of the address byte sequence before rendering. An address is only rendered as IPv6 if the sequence has the expected 16 bytes. If it has 4 bytes it is rendered as an IPv4 address instead, and any other length now renders a placeholder ("invalid IPv6 sequence") rather than crashing.

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