UBUNTU-CVE-2026-33594

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Source
https://ubuntu.com/security/CVE-2026-33594
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33594.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-33594
Upstream
  • CVE-2026-33594
Published
2026-04-22T14:16:00Z
Modified
2026-05-20T16:25:29.519142621Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A client can trigger excessive memory allocation by generating a lot of queries that are routed to an overloaded DoH backend, causing queries to accumulate into a buffer that will not be released until the end of the connection.

References

Affected packages

Ubuntu:16.04:LTS
dnsdist

Package

Name
dnsdist
Purl
pkg:deb/ubuntu/dnsdist?arch=source&distro=xenial

Affected ranges

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

Affected versions

1.*
1.0.0~alpha2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dnsdist",
            "binary_version": "1.0.0~alpha2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33594.json"
Ubuntu:25.10
dnsdist

Package

Name
dnsdist
Purl
pkg:deb/ubuntu/dnsdist?arch=source&distro=questing

Affected ranges

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

Affected versions

1.*
1.9.8-1
1.9.10-1
1.9.10-1ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dnsdist",
            "binary_version": "1.9.10-1ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33594.json"
Ubuntu:26.04:LTS
dnsdist

Package

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

Affected ranges

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

Affected versions

1.*
1.9.10-1
2.*
2.0.1-1
2.0.2-1
2.0.2-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dnsdist",
            "binary_version": "2.0.2-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33594.json"
Ubuntu:Pro:18.04:LTS
dnsdist

Package

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

Affected ranges

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

Affected versions

1.*
1.2.0-1
1.2.0-3
1.2.1-1
1.2.1-1build1
1.2.1-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dnsdist",
            "binary_version": "1.2.1-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33594.json"
Ubuntu:Pro:20.04:LTS
dnsdist

Package

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

Affected ranges

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

Affected versions

1.*
1.4.0~rc3-1
1.4.0-1
1.4.0-1build1
1.4.0-1build2
1.4.0-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dnsdist",
            "binary_version": "1.4.0-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33594.json"
Ubuntu:Pro:22.04:LTS
dnsdist

Package

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

Affected ranges

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

Affected versions

1.*
1.5.1-3build2
1.6.1-1build1
1.6.1-1ubuntu0.1~esm1
1.6.1-1ubuntu0.1~esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dnsdist",
            "binary_version": "1.6.1-1ubuntu0.1~esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33594.json"
Ubuntu:Pro:24.04:LTS
dnsdist

Package

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

Affected ranges

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

Affected versions

1.*
1.8.0-1
1.8.2-1
1.8.2-2
1.8.2-3
1.8.3-1
1.8.3-2
1.8.3-2build1
1.8.3-2build2
1.8.3-2ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dnsdist",
            "binary_version": "1.8.3-2ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33594.json"