OCTOBER 12, 2026
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Case File

CVE-2026-61551

HIGH · CVSS 8.6 EPSS 0.94% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-18 · Last synced 2026-10-12

CyberRota Analysis

AI-Generated

Icinga 2 versions prior to 2.14.9, 2.15.4, and 2.16.2 are vulnerable to a denial-of-service attack due to unbounded nesting depth in JSON parsing, which can lead to call stack exhaustion when exploited by unauthenticated remote clients. While code execution has not been demonstrated, the ability to crash the Icinga 2 service on TCP port 5665 poses a significant risk. Organizations using affected versions should prioritize upgrading to the patched releases to mitigate this vulnerability.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
code execution

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-61551
Severity
HIGH
CVSS
8.6
EPSS
0.94%

Original NVD 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.