Werk #19852: bgp_peer: tolerate unexpected address byte-list lengths

Component

Checks & agents

Title

bgp_peer: tolerate unexpected address byte-list lengths

Date

Apr 23, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.6.0b1 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.5.0p1 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

SNMP devices may return BGP peer address byte-lists whose length is neither 4 (IPv4) nor 16 (IPv6). The bgp_peer parser unconditionally tried to format such short byte strings as IPv6, which crashed with AddressValueError: At least 3 parts expected in '7c30' and aborted section parsing.

_convert_address now renders unexpected byte-list lengths as unknown(...) so parsing continues for the remaining peers.

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