CVE-2026-61551: Icinga 2 is an open source monitoring system. Prior to 2.14.9, 2.15.4, and 2.16.2, parsing deeply nested JSON can exhaust the call stack because nesting depth…

PriorityP358high8.6CVSS 3.1

AVNACLPRNUINSUCLILAH

EPSS

0.94%

60.6th percentile

Icinga 2 is an open source monitoring system. Prior to 2.14.9, 2.15.4, and 2.16.2, parsing deeply nested JSON can exhaust the call stack because nesting depth is not bounded. The affected JSON parsing paths are reachable by unauthenticated network clients through the Icinga 2 service on TCP port 5665, allowing a remote attacker to crash the process, while possible code execution has not been demonstrated. This issue is fixed in versions 2.14.9, 2.15.4, and 2.16.2.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
icinga	icinga2	< 2.14.9	2.14.9
icinga	icinga2	—	—
icinga	icinga2	—	—

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