CVE-2026-61551
highIcinga 2 is an open source monitoring system.
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
8.6
8.6 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H Severity source: NVD CVSS v3.1 (security-advisories@github.com)
Timeline (UTC)
Published: 2026-09-18 18:17
Modified: 2026-09-24 21:17
NVD status: Awaiting Analysis
Last synced 2 days ago
Verified against the source API 2026-10-27 06:54 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/Icinga/icinga2/commit/391504eaa9ed9aee81f84008c57ec821974b74ee security-advisories@github.com
- https://github.com/Icinga/icinga2/commit/3d9166ff52ff1a64a286c39af57957d63442c137 security-advisories@github.com
- https://github.com/Icinga/icinga2/commit/4964d2444ca5c4fae9036054554e1c6e0025fb89 security-advisories@github.com
- https://github.com/Icinga/icinga2/commit/ed163a8aa9d296820dd2ad14c47bf3f6a3fcce7d security-advisories@github.com
- https://github.com/Icinga/icinga2/pull/10908 security-advisories@github.com
- https://github.com/Icinga/icinga2/releases/tag/v2.14.9 security-advisories@github.com
- https://github.com/Icinga/icinga2/releases/tag/v2.15.4 security-advisories@github.com
- https://github.com/Icinga/icinga2/releases/tag/v2.16.2 security-advisories@github.com
- https://github.com/Icinga/icinga2/security/advisories/GHSA-wh38-wg57-5w7g security-advisories@github.com
- https://icinga.com/blog/icinga2-security-release-v2-16-2 security-advisories@github.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:54 UTC · record ↗