CVE-2026-61551
High
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.
SeverityHigh
CVSS8.6
Exploit probability—
ProductIcinga2
PublishedSep 18, 2026
First seenSep 18, 2026
Weakness typeCWE-674CWE-674
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Icinga icinga2 | < 2.14.9, >= 2.15.0, < 2.15.4, >= 2.16.0, < 2.16.2 | — |
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