---
id: CVE-2026-61550
title: Icinga 2 is an open source monitoring system
summary: >-
  Icinga 2 is an open source monitoring system. From 2.8 until 2.14.9, 2.15.4,
  and 2.16.2, certificate update JSON-RPC message handling does not validate
  that the sender is a trusted endpoint. An unauthenticated network attacker
  able to co…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-862
vendor: Icinga
product: icinga2
affected:
  - 'icinga2 >= 2.8, < 2.14.9'
  - 'icinga2 >= 2.15.0, < 2.15.4'
  - 'icinga2 >= 2.16.0, < 2.16.2'
published: '2026-09-18'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T21:17:06.763'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-61550'
references:
  - url: >-
      https://github.com/Icinga/icinga2/commit/4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0
    label: security-advisories@github.com
  - url: >-
      https://github.com/Icinga/icinga2/commit/6c2e0db3819f859910a4ae265461cb51b1d2039c
    label: security-advisories@github.com
  - url: >-
      https://github.com/Icinga/icinga2/commit/a6f7cc7a4ef8beed023b24416106822d6940c4c0
    label: security-advisories@github.com
  - url: >-
      https://github.com/Icinga/icinga2/commit/d37b0cfd7d9595ae2f02fadb3d724c98d8620f81
    label: security-advisories@github.com
  - url: 'https://github.com/Icinga/icinga2/pull/10907'
    label: security-advisories@github.com
  - url: 'https://github.com/Icinga/icinga2/releases/tag/v2.14.9'
    label: security-advisories@github.com
  - url: 'https://github.com/Icinga/icinga2/releases/tag/v2.15.4'
    label: security-advisories@github.com
  - url: 'https://github.com/Icinga/icinga2/releases/tag/v2.16.2'
    label: security-advisories@github.com
  - url: 'https://github.com/Icinga/icinga2/security/advisories/GHSA-vj39-ww8j-vvx5'
    label: security-advisories@github.com
  - url: 'https://icinga.com/blog/icinga2-security-release-v2-16-2'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-21T15:29:22.834072Z'
epss: 0.0037
epssPercentile: 0.30899
ingestedAt: '2026-09-18T17:46:41.548Z'
---

## Overview

Icinga 2 is an open source monitoring system. From 2.8 until 2.14.9, 2.15.4, and 2.16.2, certificate update JSON-RPC message handling does not validate that the sender is a trusted endpoint. An unauthenticated network attacker able to connect to TCP port 5665 can replace the node certificate and trusted CA certificate, impersonate a trusted node, and take control of the node. This issue is fixed in versions 2.14.9, 2.15.4, and 2.16.2.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.