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

Quick assessment

Affected
Icinga icinga2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Icinga 2 是一个开源的监控系统。在版本 2.14.9、2.15.4 和 2.16.2 之前，解析深层嵌套的 JSON 数据时，由于嵌套深度没有上限限制，可能导致调用栈溢出（call stack exhaustion）。受影响的 JSON 解析路径可以通过 Icinga 2 服务在 TCP 5665 端口上由未经身份验证的网络客户端触发，使得远程攻击者能够使进程崩溃，但尚未证实可能发生代码执行。该问题已在版本 2.14.9、2.15.4 和 2.16.2 中修复。

CVSS 8.6 · High EPSS 0.94% · P61

Affected Version Matrix 3

VendorProduct Version RangeStatus
Icinga icinga2 < 2.14.9 affected
>= 2.15.0, < 2.15.4 affected
>= 2.16.0, < 2.16.2 affected
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I. Basic Information for CVE-2026-61551

Vulnerability Information
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Vulnerability Title
Icinga 2: Stack overflow via deeply nested JSON objects
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Icinga icinga2 < 2.14.9 -

II. Public POCs for CVE-2026-61551

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III. Intelligence Information for CVE-2026-61551

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Patches & Fixes for CVE-2026-61551 (5)

Security Blog Posts for CVE-2026-61551 (1)

Other References for CVE-2026-61551 (4)

Same Patch Batch · Icinga · 2026-09-18 · 3 CVEs total

CVE-2026-61550 9.8 CRITICAL Icinga 2: Improper access control for JSON-RPC update certificate messages
CVE-2026-61552 7.2 HIGH Icinga 2 DSL Injection via Unescaped Import Template Name

IV. Related Vulnerabilities

Same product: icinga2
Same vendor: Icinga
Same weakness: CWE-674