CVE-2026-61551
Published:September 18, 2026
Updated:October 09, 2026
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 Packages
https://github.com/Icinga/icinga2.git (GITHUB):
Affected version(s) >=v2.0.0-beta1 <v2.14.9Fix Suggestion:
Update to version v2.14.9https://github.com/Icinga/icinga2.git (GITHUB):
Affected version(s) >=v2.15.0 <v2.15.4Fix Suggestion:
Update to version v2.15.4https://github.com/Icinga/icinga2.git (GITHUB):
Affected version(s) >=v2.16.0 <v2.16.2Fix Suggestion:
Update to version v2.16.2Related Resources (12)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.6
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
HIGH
Weakness Type (CWE)
Uncontrolled Recursion
EPSS
Base Score:
0.94