CVE-2026-61551: CWE-674: Uncontrolled Recursion in Icinga icinga2
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.
AI Analysis
Technical Summary
CVE-2026-61551 is a vulnerability in Icinga 2's JSON parser where deeply nested JSON input leads to uncontrolled recursion, exhausting the call stack. This vulnerability is reachable by unauthenticated network clients via the Icinga 2 service on TCP port 5665. The flaw allows remote attackers to crash the Icinga 2 process, resulting in denial of service. There is no evidence of remote code execution. The vulnerability is addressed in versions 2.14.9, 2.15.4, and 2.16.2.
Potential Impact
Remote unauthenticated attackers can cause a denial of service by crashing the Icinga 2 process through sending deeply nested JSON payloads. Confidentiality and integrity impacts are rated low, while availability impact is high. No known exploits in the wild or code execution have been reported.
Mitigation Recommendations
Upgrade Icinga 2 to version 2.14.9, 2.15.4, or 2.16.2 or later, where this vulnerability is fixed. No other mitigation is indicated or required.
CVE-2026-61551: CWE-674: Uncontrolled Recursion in Icinga icinga2
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.
CVSS v3.1
Score 8.6high
Affected software
Icinga
icinga2
pkg:github/icinga/icinga2Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-61551 is a vulnerability in Icinga 2's JSON parser where deeply nested JSON input leads to uncontrolled recursion, exhausting the call stack. This vulnerability is reachable by unauthenticated network clients via the Icinga 2 service on TCP port 5665. The flaw allows remote attackers to crash the Icinga 2 process, resulting in denial of service. There is no evidence of remote code execution. The vulnerability is addressed in versions 2.14.9, 2.15.4, and 2.16.2.
Potential Impact
Remote unauthenticated attackers can cause a denial of service by crashing the Icinga 2 process through sending deeply nested JSON payloads. Confidentiality and integrity impacts are rated low, while availability impact is high. No known exploits in the wild or code execution have been reported.
Mitigation Recommendations
Upgrade Icinga 2 to version 2.14.9, 2.15.4, or 2.16.2 or later, where this vulnerability is fixed. No other mitigation is indicated or required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-10T16:48:39.922Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aad759d55bf5e2cf54f30a4
Added to database: 09/18/2026, 17:32:13 UTC
Last enriched: 09/18/2026, 17:47:42 UTC
Last updated: 09/18/2026, 22:12:51 UTC
Views: 5
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