UBUNTU-CVE-2026-48553

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Source
https://ubuntu.com/security/CVE-2026-48553
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48553.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-48553
Upstream
Published
2026-08-12T17:17:00Z
Modified
2026-08-19T11:05:27Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • 7.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 are vulnerable to authenticated remote code execution via custom-variable macro injection through the Nagios Remote Data Processor (NRDP). When a custom variable defined on a host, service, or contact is referenced in a shell-executed command line, an authenticated attacker with NRDP access can inject OS commands through the macro value. Exploitation requires a non-default configuration in which a custom variable is defined and referenced in a shell-executed command.

References

Affected packages

Ubuntu:20.04:LTS / nagios4

Package

Name
nagios4
Purl
pkg:deb/ubuntu/nagios4?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.3.4-3
4.3.4-3ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nagios4",
            "binary_version": "4.3.4-3ubuntu0.1"
        },
        {
            "binary_name": "nagios4-cgi",
            "binary_version": "4.3.4-3ubuntu0.1"
        },
        {
            "binary_name": "nagios4-common",
            "binary_version": "4.3.4-3ubuntu0.1"
        },
        {
            "binary_name": "nagios4-core",
            "binary_version": "4.3.4-3ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48553.json"

Ubuntu:22.04:LTS / nagios4

Package

Name
nagios4
Purl
pkg:deb/ubuntu/nagios4?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.4.6-4
4.4.6-4ubuntu0.22.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nagios4",
            "binary_version": "4.4.6-4ubuntu0.22.04.1"
        },
        {
            "binary_name": "nagios4-cgi",
            "binary_version": "4.4.6-4ubuntu0.22.04.1"
        },
        {
            "binary_name": "nagios4-common",
            "binary_version": "4.4.6-4ubuntu0.22.04.1"
        },
        {
            "binary_name": "nagios4-core",
            "binary_version": "4.4.6-4ubuntu0.22.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48553.json"

Ubuntu:24.04:LTS / nagios4

Package

Name
nagios4
Purl
pkg:deb/ubuntu/nagios4?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.4.6-4
4.4.6-4ubuntu0.24.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nagios4",
            "binary_version": "4.4.6-4ubuntu0.24.04.1"
        },
        {
            "binary_name": "nagios4-cgi",
            "binary_version": "4.4.6-4ubuntu0.24.04.1"
        },
        {
            "binary_name": "nagios4-common",
            "binary_version": "4.4.6-4ubuntu0.24.04.1"
        },
        {
            "binary_name": "nagios4-core",
            "binary_version": "4.4.6-4ubuntu0.24.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48553.json"

Ubuntu:26.04:LTS / nagios4

Package

Name
nagios4
Purl
pkg:deb/ubuntu/nagios4?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.4.6-4.1ubuntu1
4.4.6-4.1ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nagios4",
            "binary_version": "4.4.6-4.1ubuntu2"
        },
        {
            "binary_name": "nagios4-cgi",
            "binary_version": "4.4.6-4.1ubuntu2"
        },
        {
            "binary_name": "nagios4-common",
            "binary_version": "4.4.6-4.1ubuntu2"
        },
        {
            "binary_name": "nagios4-core",
            "binary_version": "4.4.6-4.1ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48553.json"