Is CVE-2026-61551 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-61551?

CVE-2026-61551 has a CVSS v3 severity of HIGH (8.6).

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CVE-2026-61551

Description

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.