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Vulnerability · Published Sep 18, 2026 · Assigned by GitHub_M

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

High 8.6

In plain English

A high-severity security flaw in icinga2 from Icinga. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 61% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.6High
Exploit odds (30 days)0.9%top 38.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12icinga2no fix listedDEBIAN-CVE-2026-61551
Debian:13icinga22.14.6-1+deb13u1DEBIAN-CVE-2026-61551
Debian:14icinga22.16.2-1DEBIAN-CVE-2026-61551
Ubuntu:22.04:LTSicinga2no fix listedUBUNTU-CVE-2026-61551
Ubuntu:24.04:LTSicinga2no fix listedUBUNTU-CVE-2026-61551
Ubuntu:26.04:LTSicinga2no fix listedUBUNTU-CVE-2026-61551

Affected products (as reported)

VendorProductVersions
Icinga icinga2 < 2.14.9>= 2.15.0, < 2.15.4>= 2.16.0, < 2.16.2

Weakness: CWE-674 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

References