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CVE-2026-61551

8.6 · HIGH

Icinga 2 is an open source monitoring system.

Published Sep 18, 2026CWE-674EPSS 0.94%

Overview

CVE-2026-61551 is a high-severity vulnerability. It was published on September 18, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/Icinga/icinga2/commit/391504eaa9ed9aee81f84008c57ec821974b74eeGitHubgithub.com/Icinga/icinga2/commit/3d9166ff52ff1a64a286c39af57957d63442c137GitHubgithub.com/Icinga/icinga2/commit/4964d2444ca5c4fae9036054554e1c6e0025fb89GitHubgithub.com/Icinga/icinga2/commit/ed163a8aa9d296820dd2ad14c47bf3f6a3fcce7dGitHubgithub.com/Icinga/icinga2/pull/10908GitHubgithub.com/Icinga/icinga2/releases/tag/v2.14.9GitHubgithub.com/Icinga/icinga2/releases/tag/v2.15.4GitHubgithub.com/Icinga/icinga2/releases/tag/v2.16.2GitHubgithub.com/Icinga/icinga2/security/advisories/GHSA-wh38-wg57-5w7gReficinga.com/blog/icinga2-security-release-v2-16-2

How CyberStrike helps

Frequently asked questions

What is CVE-2026-61551?

CVE-2026-61551 is a high-severity vulnerability. It was published on September 18, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

How severe is CVE-2026-61551?

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-61551?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-61551?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-61551 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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