CVE-2026-61551

Icinga 2: Stack overflow via deeply nested JSON objects

Published: Sep 18, 2026Updated: Sep 18, 2026 Sources: CVE List NVDCWE-674

8.6HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:LConfidentiality

Low

I:LIntegrity

Low

A:HAvailability

High

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Weaknesses

CWE-674

Affected Products

Icinga

oss-project·USaka icinga2, icinga web 2

icinga2On-premWeb App

Enterprise Software / itsm-monitoring

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Impact

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References

https://github.com/Icinga/icinga2/commit/391504eaa9ed9aee81f84008c57ec821974b74ee

github.com

https://github.com/Icinga/icinga2/commit/3d9166ff52ff1a64a286c39af57957d63442c137

github.com

https://github.com/Icinga/icinga2/commit/4964d2444ca5c4fae9036054554e1c6e0025fb89

github.com

and 7 more references View all →

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