High 8.6Published Sep 18, 2026

CVE-2026-61551Icinga 2: Stack overflow via deeply nested JSON objects

Updated under an hour ago (2026-10-19 07:23 UTC)

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Every CVE for icinga2

Exploited in the last 30 days

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 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Weakness (CWE): CWE-674
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Sep 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Icinga icinga2 icinga:icinga2 (from the name)	before 2.14.9; from 2.15.0, < 2.15.4; from 2.16.0, < 2.16.2	CNA record

References

https://github.com/Icinga/icinga2/security/advisories/GHSA-wh38-wg57-5w7gx-refsource-confirm
https://github.com/Icinga/icinga2/pull/10908x-refsource-misc
https://github.com/Icinga/icinga2/commit/391504eaa9ed9aee81f84008c57ec821974b74eex-refsource-misc
https://github.com/Icinga/icinga2/commit/3d9166ff52ff1a64a286c39af57957d63442c137x-refsource-misc
https://github.com/Icinga/icinga2/commit/4964d2444ca5c4fae9036054554e1c6e0025fb89x-refsource-misc
https://github.com/Icinga/icinga2/commit/ed163a8aa9d296820dd2ad14c47bf3f6a3fcce7dx-refsource-misc
https://github.com/Icinga/icinga2/releases/tag/v2.14.9x-refsource-misc
https://github.com/Icinga/icinga2/releases/tag/v2.15.4x-refsource-misc
https://github.com/Icinga/icinga2/releases/tag/v2.16.2x-refsource-misc
https://icinga.com/blog/icinga2-security-release-v2-16-2x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.