CVE-2026-61551

HIGH 8.6

Icinga 2: Stack overflow via deeply nested JSON objects

CVSS Score

8.6

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-674
Vendor	icinga
Product	icinga2
Published	Sep 18, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

High

Affected Versions

Icinga / icinga2

< 2.14.9 >= 2.15.0, < 2.15.4 >= 2.16.0, < 2.16.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗