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.
References10
- github.com/Icinga/icinga2/commit/391504eaa9ed9aee81f84008c57ec8…
- github.com/Icinga/icinga2/commit/3d9166ff52ff1a64a286c39af57957…
- github.com/Icinga/icinga2/commit/4964d2444ca5c4fae9036054554e1c…
- github.com/Icinga/icinga2/commit/ed163a8aa9d296820dd2ad14c47bf3…
- github.com/Icinga/icinga2/pull/10908
- github.com/Icinga/icinga2/releases/tag/v2.14.9
- github.com/Icinga/icinga2/releases/tag/v2.15.4
- github.com/Icinga/icinga2/releases/tag/v2.16.2
- github.com/Icinga/icinga2/security/advisories/GHSA-wh38-wg57-5w…
- icinga.com/blog/icinga2-security-release-v2-16-2
Metrics
- CVSS 3.1
-
8.6
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H - EPSS — exploit probability
- 1% percentile: 61 · as of 8 November 2026
- CWE
- CWE-674
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.