Allocation of Resources Without Limits or Throttling in Icinga - #VU144222
Published: August 18, 2026
Vulnerability identifier: #VU144222
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in the JSON-RPC message handling logic when processing announced large messages on JSON-RPC connections. A remote user can announce a large message size to cause a denial of service.
Exploitation may cause the Icinga 2 process to crash in an out-of-memory scenario. Allocations larger than roughly 1 GB require compromise of more than one endpoint certificate because each endpoint is limited to one allocation at a time.
Affected software
Icinga
Remediation
Install security update from vendor's website.
Icinga - addressed in versions 2.15.6, 2.16.5