# CVE-2026-61551: icinga2: Icinga 2 is an open source monitoring system

CVE-2026-61551 is fixed in icinga2 on 1 platform, first by DEBIAN-CVE-2026-61551, released August 10, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-61551
- Priority: High
- CVSS: 8.6 (high)
- EPSS: 0.0094
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 18, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | icinga2 Debian 13.5 (trixie) | 2.14.6-1+deb13u1 | [DEBIAN-CVE-2026-61551](https://patchblox.com/security/data/fix/linux/debian-cve-2026-61551.md) | Aug 10, 2026 |
| Linux | icinga2 Debian 14 | 2.16.2-1 | [DEBIAN-CVE-2026-61551](https://patchblox.com/security/data/fix/linux/debian-cve-2026-61551.md) | Aug 10, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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