UBUNTU-CVE-2026-61551 (CVE-2026-61551)
Vulnerability from osv_ubuntu – Published: 2026-09-18 18:17 – Updated: 2026-09-23 23:31 – Source website
VLAI
Details
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.
Severity
8.6 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "icinga2",
"binary_version": "2.4.1-2ubuntu1"
},
{
"binary_name": "icinga2-bin",
"binary_version": "2.4.1-2ubuntu1"
},
{
"binary_name": "icinga2-classicui",
"binary_version": "2.4.1-2ubuntu1"
},
{
"binary_name": "icinga2-common",
"binary_version": "2.4.1-2ubuntu1"
},
{
"binary_name": "icinga2-ido-mysql",
"binary_version": "2.4.1-2ubuntu1"
},
{
"binary_name": "icinga2-ido-pgsql",
"binary_version": "2.4.1-2ubuntu1"
},
{
"binary_name": "icinga2-studio",
"binary_version": "2.4.1-2ubuntu1"
},
{
"binary_name": "libicinga2",
"binary_version": "2.4.1-2ubuntu1"
},
{
"binary_name": "vim-icinga2",
"binary_version": "2.4.1-2ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "icinga2",
"purl": "pkg:deb/ubuntu/icinga2@2.4.1-2ubuntu1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.3.8-1build1",
"2.3.11-1",
"2.4.0-1",
"2.4.1-1",
"2.4.1-2",
"2.4.1-2ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "icinga2",
"binary_version": "2.8.1-0ubuntu2"
},
{
"binary_name": "icinga2-bin",
"binary_version": "2.8.1-0ubuntu2"
},
{
"binary_name": "icinga2-classicui",
"binary_version": "2.8.1-0ubuntu2"
},
{
"binary_name": "icinga2-common",
"binary_version": "2.8.1-0ubuntu2"
},
{
"binary_name": "icinga2-ido-mysql",
"binary_version": "2.8.1-0ubuntu2"
},
{
"binary_name": "icinga2-ido-pgsql",
"binary_version": "2.8.1-0ubuntu2"
},
{
"binary_name": "icinga2-studio",
"binary_version": "2.8.1-0ubuntu2"
},
{
"binary_name": "libicinga2",
"binary_version": "2.8.1-0ubuntu2"
},
{
"binary_name": "vim-icinga2",
"binary_version": "2.8.1-0ubuntu2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "icinga2",
"purl": "pkg:deb/ubuntu/icinga2@2.8.1-0ubuntu2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.7.0-1",
"2.8.1-0ubuntu2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "icinga2",
"binary_version": "2.11.2-1ubuntu3"
},
{
"binary_name": "icinga2-bin",
"binary_version": "2.11.2-1ubuntu3"
},
{
"binary_name": "icinga2-common",
"binary_version": "2.11.2-1ubuntu3"
},
{
"binary_name": "icinga2-ido-mysql",
"binary_version": "2.11.2-1ubuntu3"
},
{
"binary_name": "icinga2-ido-pgsql",
"binary_version": "2.11.2-1ubuntu3"
},
{
"binary_name": "vim-icinga2",
"binary_version": "2.11.2-1ubuntu3"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "icinga2",
"purl": "pkg:deb/ubuntu/icinga2@2.11.2-1ubuntu3?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.10.5-1build1",
"2.11.2-1",
"2.11.2-1ubuntu1",
"2.11.2-1ubuntu2",
"2.11.2-1ubuntu3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "icinga2",
"binary_version": "2.13.2-1build2"
},
{
"binary_name": "icinga2-bin",
"binary_version": "2.13.2-1build2"
},
{
"binary_name": "icinga2-common",
"binary_version": "2.13.2-1build2"
},
{
"binary_name": "icinga2-ido-mysql",
"binary_version": "2.13.2-1build2"
},
{
"binary_name": "icinga2-ido-pgsql",
"binary_version": "2.13.2-1build2"
},
{
"binary_name": "vim-icinga2",
"binary_version": "2.13.2-1build2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "icinga2",
"purl": "pkg:deb/ubuntu/icinga2@2.13.2-1build2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.12.3-1",
"2.13.1-1",
"2.13.2-1",
"2.13.2-1build1",
"2.13.2-1build2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "icinga2",
"binary_version": "2.14.2-1build2"
},
{
"binary_name": "icinga2-bin",
"binary_version": "2.14.2-1build2"
},
{
"binary_name": "icinga2-common",
"binary_version": "2.14.2-1build2"
},
{
"binary_name": "icinga2-ido-mysql",
"binary_version": "2.14.2-1build2"
},
{
"binary_name": "icinga2-ido-pgsql",
"binary_version": "2.14.2-1build2"
},
{
"binary_name": "vim-icinga2",
"binary_version": "2.14.2-1build2"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "icinga2",
"purl": "pkg:deb/ubuntu/icinga2@2.14.2-1build2?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.13.8-1",
"2.14.1-1",
"2.14.2-1",
"2.14.2-1build1",
"2.14.2-1build2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "icinga2",
"binary_version": "2.15.1-1"
},
{
"binary_name": "icinga2-bin",
"binary_version": "2.15.1-1"
},
{
"binary_name": "icinga2-common",
"binary_version": "2.15.1-1"
},
{
"binary_name": "icinga2-ido-mysql",
"binary_version": "2.15.1-1"
},
{
"binary_name": "icinga2-ido-pgsql",
"binary_version": "2.15.1-1"
},
{
"binary_name": "vim-icinga2",
"binary_version": "2.15.1-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "icinga2",
"purl": "pkg:deb/ubuntu/icinga2@2.15.1-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.15.0-1",
"2.15.1-1"
]
}
],
"aliases": [],
"details": "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.",
"id": "UBUNTU-CVE-2026-61551",
"modified": "2026-09-23T23:31:26Z",
"published": "2026-09-18T18:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-61551"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-61551"
},
{
"type": "REPORT",
"url": "https://github.com/Icinga/icinga2/security/advisories/GHSA-wh38-wg57-5w7g"
},
{
"type": "REPORT",
"url": "https://icinga.com/blog/icinga2-security-release-v2-16-2/"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-61551"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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