UBUNTU-CVE-2026-121506

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Source
https://ubuntu.com/security/CVE-2026-121506
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121506.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-121506
Upstream
Published
2026-11-03T15:17:00Z
Modified
2026-11-05T11:46:31Z
Severity
  • 7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

An out-of-bounds read and write in NTS client extension field parsing (extens_client_recv) in NTPsec before 1.2.5 allows a remote attacker who can send NTP server-mode replies to an NTS client to corrupt heap memory and crash ntpd, and, combined with the NTS-KE client out-of-bounds read fixed in 1.2.4, to bypass NTS authentication and set the client's time, via an NTS Authenticator and Encrypted Extension Fields field whose nonce length exceeds the field.

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-2026-121506.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-2026-121506.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-2026-121506.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-2026-121506.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-2026-121506.json"
Ubuntu:26.10
ntpsec

Package

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

Affected ranges

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

Affected versions

1.*
1.2.3+dfsg1-8ubuntu2
1.2.3+dfsg1-8ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ntpsec",
            "binary_version": "1.2.3+dfsg1-8ubuntu3"
        },
        {
            "binary_name": "ntpsec-ntpdate",
            "binary_version": "1.2.3+dfsg1-8ubuntu3"
        },
        {
            "binary_name": "ntpsec-ntpdig",
            "binary_version": "1.2.3+dfsg1-8ubuntu3"
        },
        {
            "binary_name": "ntpsec-ntpviz",
            "binary_version": "1.2.3+dfsg1-8ubuntu3"
        },
        {
            "binary_name": "python3-ntp",
            "binary_version": "1.2.3+dfsg1-8ubuntu3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121506.json"