UBUNTU-CVE-2026-18321

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Source
https://ubuntu.com/security/CVE-2026-18321
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18321.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-18321
Upstream
  • CVE-2026-18321
Published
2026-07-31T19:17:00Z
Modified
2026-08-06T00:12:19Z
Severity
  • 4.7 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Buffer overflow in NTPsec's Zyfer refclock allows local attacker to crash ntpd

References

Affected packages

Ubuntu:18.04:LTS / ntpsec

Package

Name
ntpsec
Purl
pkg:deb/ubuntu/ntpsec?arch=source&distro=bionic

Affected ranges

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

Affected versions

1.*
1.0.0+dfsg1-1
1.0.0+dfsg1-3
1.1.0+dfsg1-1
1.1.0+dfsg1-1ubuntu0.1
1.1.0+dfsg1-1ubuntu0.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ntpsec",
            "binary_version": "1.1.0+dfsg1-1ubuntu0.2"
        },
        {
            "binary_name": "ntpsec-ntpdate",
            "binary_version": "1.1.0+dfsg1-1ubuntu0.2"
        },
        {
            "binary_name": "ntpsec-ntpviz",
            "binary_version": "1.1.0+dfsg1-1ubuntu0.2"
        },
        {
            "binary_name": "python3-ntp",
            "binary_version": "1.1.0+dfsg1-1ubuntu0.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18321.json"

Ubuntu:20.04:LTS / ntpsec

Package

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

Affected ranges

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

Affected versions

1.*
1.1.3+dfsg1-2
1.1.7+dfsg1-1
1.1.7+dfsg1-2
1.1.8+dfsg1-1
1.1.8+dfsg1-3
1.1.8+dfsg1-4
1.1.8+dfsg1-4build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ntpsec",
            "binary_version": "1.1.8+dfsg1-4build1"
        },
        {
            "binary_name": "ntpsec-ntpdate",
            "binary_version": "1.1.8+dfsg1-4build1"
        },
        {
            "binary_name": "ntpsec-ntpviz",
            "binary_version": "1.1.8+dfsg1-4build1"
        },
        {
            "binary_name": "python3-ntp",
            "binary_version": "1.1.8+dfsg1-4build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18321.json"

Ubuntu:22.04:LTS / ntpsec

Package

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

Affected ranges

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

Affected versions

1.*
1.2.0+dfsg1-4
1.2.1+dfsg1-2
1.2.1+dfsg1-3
1.2.1+dfsg1-3ubuntu1
1.2.1+dfsg1-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ntpsec",
            "binary_version": "1.2.1+dfsg1-4"
        },
        {
            "binary_name": "ntpsec-ntpdate",
            "binary_version": "1.2.1+dfsg1-4"
        },
        {
            "binary_name": "ntpsec-ntpviz",
            "binary_version": "1.2.1+dfsg1-4"
        },
        {
            "binary_name": "python3-ntp",
            "binary_version": "1.2.1+dfsg1-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18321.json"

Ubuntu:24.04:LTS / ntpsec

Package

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

Affected ranges

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

Affected versions

1.*
1.2.2+dfsg1-2
1.2.2+dfsg1-3
1.2.2+dfsg1-4
1.2.2+dfsg1-4build1
1.2.2+dfsg1-4build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ntp",
            "binary_version": "1:4.2.8p15+dfsg-2~1.2.2+dfsg1-4build2"
        },
        {
            "binary_name": "ntpdate",
            "binary_version": "1:4.2.8p15+dfsg-2~1.2.2+dfsg1-4build2"
        },
        {
            "binary_name": "ntpsec",
            "binary_version": "1.2.2+dfsg1-4build2"
        },
        {
            "binary_name": "ntpsec-ntpdate",
            "binary_version": "1.2.2+dfsg1-4build2"
        },
        {
            "binary_name": "ntpsec-ntpdig",
            "binary_version": "1.2.2+dfsg1-4build2"
        },
        {
            "binary_name": "ntpsec-ntpviz",
            "binary_version": "1.2.2+dfsg1-4build2"
        },
        {
            "binary_name": "python3-ntp",
            "binary_version": "1.2.2+dfsg1-4build2"
        },
        {
            "binary_name": "sntp",
            "binary_version": "1:4.2.8p15+dfsg-2~1.2.2+dfsg1-4build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18321.json"

Ubuntu:26.04:LTS / ntpsec

Package

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

Affected ranges

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

Affected versions

1.*
1.2.3+dfsg1-8ubuntu1
1.2.3+dfsg1-8ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ntpsec",
            "binary_version": "1.2.3+dfsg1-8ubuntu2"
        },
        {
            "binary_name": "ntpsec-ntpdate",
            "binary_version": "1.2.3+dfsg1-8ubuntu2"
        },
        {
            "binary_name": "ntpsec-ntpdig",
            "binary_version": "1.2.3+dfsg1-8ubuntu2"
        },
        {
            "binary_name": "ntpsec-ntpviz",
            "binary_version": "1.2.3+dfsg1-8ubuntu2"
        },
        {
            "binary_name": "python3-ntp",
            "binary_version": "1.2.3+dfsg1-8ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18321.json"