Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/Icinga/icinga2/commit/391504eaa9ed9aee81f84008c57ec821974b74e
- https://github.com/Icinga/icinga2/commit/3d9166ff52ff1a64a286c39af57957d63442c13
- https://github.com/Icinga/icinga2/commit/4964d2444ca5c4fae9036054554e1c6e0025fb8
- https://github.com/Icinga/icinga2/commit/ed163a8aa9d296820dd2ad14c47bf3f6a3fcce7
- https://github.com/Icinga/icinga2/pull/10908
- https://github.com/Icinga/icinga2/releases/tag/v2.14.9
- https://github.com/Icinga/icinga2/releases/tag/v2.15.4
- https://github.com/Icinga/icinga2/releases/tag/v2.16.2
- https://github.com/Icinga/icinga2/security/advisories/GHSA-wh38-wg57-5w7g
- https://icinga.com/blog/icinga2-security-release-v2-16-2
FAQ
What is CVE-2026-61551?
CVE-2026-61551 is a vulnerability with a CVSS score of 8.6 (HIGH). 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...
How severe is CVE-2026-61551?
CVE-2026-61551 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-61551?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.