UBUNTU-CVE-2026-19538

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Source
https://ubuntu.com/security/CVE-2026-19538
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19538.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-19538
Upstream
  • CVE-2026-19538
Published
2026-08-26T09:16:00Z
Modified
2026-09-02T16:12:08Z
Severity
  • 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open.

References

Affected packages

Ubuntu:Pro:16.04:LTS
nsd

Package

Name
nsd
Purl
pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps-legacy%2Fxenial

Affected ranges

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

Affected versions

4.*
4.1.2-1
4.1.6-1
4.1.7-1
4.1.7-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.1.7-1ubuntu0.1~esm1",
            "binary_name": "nsd"
        },
        {
            "binary_version": "4.1.7-1ubuntu0.1~esm1",
            "binary_name": "nsd3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19538.json"
Ubuntu:Pro:18.04:LTS
nsd

Package

Name
nsd
Purl
pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps%2Fbionic

Affected ranges

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

Affected versions

4.*
4.1.16-1build1
4.1.17-1
4.1.17-1build1
4.1.17-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.1.17-1ubuntu0.1~esm1",
            "binary_name": "nsd"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19538.json"
Ubuntu:Pro:20.04:LTS
nsd

Package

Name
nsd
Purl
pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps%2Ffocal

Affected ranges

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

Affected versions

4.*
4.1.26-1
4.1.26-1build1
4.1.26-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.1.26-1ubuntu0.1~esm1",
            "binary_name": "nsd"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19538.json"
Ubuntu:Pro:22.04:LTS
nsd

Package

Name
nsd
Purl
pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps%2Fjammy

Affected ranges

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

Affected versions

4.*
4.3.5-1
4.3.7-1
4.3.8-1
4.3.8-1build1
4.3.9-1
4.3.9-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.3.9-1ubuntu0.1~esm1",
            "binary_name": "nsd"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19538.json"
Ubuntu:Pro:24.04:LTS
nsd

Package

Name
nsd
Purl
pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps%2Fnoble

Affected ranges

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

Affected versions

4.*
4.7.0-1
4.8.0-1
4.8.0-1build1
4.8.0-1build3
4.8.0-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.8.0-1ubuntu0.1~esm1",
            "binary_name": "nsd"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19538.json"
Ubuntu:Pro:26.04:LTS
nsd

Package

Name
nsd
Purl
pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps%2Fresolute

Affected ranges

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

Affected versions

4.*
4.12.0-1
4.13.0-6
4.14.0-1
4.14.0-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.14.0-1ubuntu0.1~esm1",
            "binary_name": "nsd"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19538.json"