Unrated

UBUNTU-CVE-2026-61551

Type: advisorySource: OSV1 source record

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.

Announced 18 Sept 2026Source revision 1

Original source ↗

UBUNTU-CVE-2026-61551

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:UBUNTU-CVE-2026-61551

icinga2

Source reference: /affected/0/package/name

Affected versions: 2.3.8-1build1
Source reference: /affected/0/versions
2.3.11-1
Source reference: /affected/0/versions
2.4.0-1
Source reference: /affected/0/versions
2.4.1-1
Source reference: /affected/0/versions
2.4.1-2
Source reference: /affected/0/versions
2.4.1-2ubuntu1
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

icinga2

Source reference: /affected/1/package/name

Affected versions: 2.7.0-1
Source reference: /affected/1/versions
2.8.1-0ubuntu2
Source reference: /affected/1/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

icinga2

Source reference: /affected/2/package/name

Affected versions: 2.10.5-1build1
Source reference: /affected/2/versions
2.11.2-1
Source reference: /affected/2/versions
2.11.2-1ubuntu1
Source reference: /affected/2/versions
2.11.2-1ubuntu2
Source reference: /affected/2/versions
2.11.2-1ubuntu3
Source reference: /affected/2/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

icinga2

Source reference: /affected/3/package/name

Affected versions: 2.12.3-1
Source reference: /affected/3/versions
2.13.1-1
Source reference: /affected/3/versions
2.13.2-1
Source reference: /affected/3/versions
2.13.2-1build1
Source reference: /affected/3/versions
2.13.2-1build2
Source reference: /affected/3/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

icinga2

Source reference: /affected/4/package/name

Affected versions: 2.13.8-1
Source reference: /affected/4/versions
2.14.1-1
Source reference: /affected/4/versions
2.14.2-1
Source reference: /affected/4/versions
2.14.2-1build1
Source reference: /affected/4/versions
2.14.2-1build2
Source reference: /affected/4/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

icinga2

Source reference: /affected/5/package/name

Affected versions: 2.15.0-1
Source reference: /affected/5/versions
2.15.1-1
Source reference: /affected/5/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

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    "package": {
      "name": "icinga2",
      "purl": "pkg:deb/ubuntu/icinga2?arch=source&distro=xenial",
      "ecosystem": "Ubuntu:16.04:LTS"
    },
    "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"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61551.json"
    },
    "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",
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        },
        {
          "binary_name": "icinga2-ido-pgsql",
          "binary_version": "2.4.1-2ubuntu1"
        },
        {
          "binary_name": "icinga2-studio",
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        },
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        },
        {
          "binary_name": "icinga2-classicui",
          "binary_version": "2.8.1-0ubuntu2"
        },
        {
          "binary_name": "icinga2-common",
          "binary_version": "2.8.1-0ubuntu2"
        },
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        },
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        {
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    "package": {
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      "purl": "pkg:deb/ubuntu/icinga2?arch=source&distro=focal",
      "ecosystem": "Ubuntu:20.04:LTS"
    },
    "versions": [
      "2.10.5-1build1",
      "2.11.2-1",
      "2.11.2-1ubuntu1",
      "2.11.2-1ubuntu2",
      "2.11.2-1ubuntu3"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61551.json"
    },
    "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"
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      ]
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  },
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    "ranges": [
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    ],
    "package": {
      "name": "icinga2",
      "purl": "pkg:deb/ubuntu/icinga2?arch=source&distro=jammy",
      "ecosystem": "Ubuntu:22.04:LTS"
    },
    "versions": [
      "2.12.3-1",
      "2.13.1-1",
      "2.13.2-1",
      "2.13.2-1build1",
      "2.13.2-1build2"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61551.json"
    },
    "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"
        }
      ]
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  },
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      "purl": "pkg:deb/ubuntu/icinga2?arch=source&distro=noble",
      "ecosystem": "Ubuntu:24.04:LTS"
    },
    "versions": [
      "2.13.8-1",
      "2.14.1-1",
      "2.14.2-1",
      "2.14.2-1build1",
      "2.14.2-1build2"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61551.json"
    },
    "ecosystem_specific": {
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        {
          "binary_name": "icinga2",
          "binary_version": "2.14.2-1build2"
        },
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          "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"
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          "binary_name": "vim-icinga2",
          "binary_version": "2.14.2-1build2"
        }
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  },
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        "events": [
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    "package": {
      "name": "icinga2",
      "purl": "pkg:deb/ubuntu/icinga2?arch=source&distro=resolute",
      "ecosystem": "Ubuntu:26.04:LTS"
    },
    "versions": [
      "2.15.0-1",
      "2.15.1-1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61551.json"
    },
    "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"
        }
      ]
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #5806 · Revision 1
Added to Heist Feed: Sat, 24 Oct 2026 22:14:04 GMT
Publisher date: Fri, 18 Sep 2026 18:17:00 GMT

Read the original announcement