Icinga 2: Stack overflow via deeply nested JSON objects

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-61551
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 18:17:08 UTC
Updated2026-09-18 18:17:08 UTC
DescriptionIcinga 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.

Risk And Classification

Primary CVSS: v3.1 8.6 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Problem Types: CWE-674 | CWE-674 CWE-674: Uncontrolled Recursion

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
3.1CNADECLARED8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Icinga Icinga2 affected < 2.14.9 Not specified
CNA Icinga Icinga2 affected >= 2.15.0, < 2.15.4 Not specified
CNA Icinga Icinga2 affected >= 2.16.0, < 2.16.2 Not specified

References

ReferenceSourceLinkTags
icinga.com/blog/icinga2-security-release-v2-16-2 [email protected] icinga.com
github.com/Icinga/icinga2/pull/10908 [email protected] github.com
github.com/Icinga/icinga2/commit/391504eaa9ed9aee81f84008c57ec821974b74ee [email protected] github.com
github.com/Icinga/icinga2/commit/3d9166ff52ff1a64a286c39af57957d63442c137 [email protected] github.com
github.com/Icinga/icinga2/releases/tag/v2.16.2 [email protected] github.com
github.com/Icinga/icinga2/commit/4964d2444ca5c4fae9036054554e1c6e0025fb89 [email protected] github.com
github.com/Icinga/icinga2/commit/ed163a8aa9d296820dd2ad14c47bf3f6a3fcce7d [email protected] github.com
github.com/Icinga/icinga2/releases/tag/v2.15.4 [email protected] github.com
github.com/Icinga/icinga2/security/advisories/GHSA-wh38-wg57-5w7g [email protected] github.com
github.com/Icinga/icinga2/releases/tag/v2.14.9 [email protected] github.com
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