UBUNTU-CVE-2026-5946

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Source
https://ubuntu.com/security/CVE-2026-5946
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5946.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-5946
Upstream
Downstream
Related
Published
2026-05-20T00:00:00Z
Modified
2026-08-27T04:40:54Z
Severity
  • 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
  • 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

Multiple flaws have been identified in named related to the handling of DNS messages whose CLASS is not Internet (IN) — for example, CHAOS or HESIOD, or DNS messages that specify meta-classes (ANY or NONE) in the question section. Specially crafted requests reaching the affected code paths — recursion, dynamic updates (UPDATE), zone change notifications (NOTIFY), or processing of IN-specific record types in non-IN data — can cause assertion failures in named. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

References

Affected packages

Ubuntu:20.04:LTS
bind9-libs

Package

Name
bind9-libs
Purl
pkg:deb/ubuntu/bind9-libs?arch=source&distro=focal

Affected ranges

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

Affected versions

1:9.*
1:9.11.16+dfsg-3~build1
1:9.11.16+dfsg-3~ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libbind9-161",
            "binary_version": "1:9.11.16+dfsg-3~ubuntu1"
        },
        {
            "binary_name": "libdns-export1109",
            "binary_version": "1:9.11.16+dfsg-3~ubuntu1"
        },
        {
            "binary_name": "libdns1109",
            "binary_version": "1:9.11.16+dfsg-3~ubuntu1"
        },
        {
            "binary_name": "libirs-export161",
            "binary_version": "1:9.11.16+dfsg-3~ubuntu1"
        },
        {
            "binary_name": "libirs161",
            "binary_version": "1:9.11.16+dfsg-3~ubuntu1"
        },
        {
            "binary_name": "libisc-export1105",
            "binary_version": "1:9.11.16+dfsg-3~ubuntu1"
        },
        {
            "binary_name": "libisc1105",
            "binary_version": "1:9.11.16+dfsg-3~ubuntu1"
        },
        {
            "binary_name": "libisccc-export161",
            "binary_version": "1:9.11.16+dfsg-3~ubuntu1"
        },
        {
            "binary_name": "libisccc161",
            "binary_version": "1:9.11.16+dfsg-3~ubuntu1"
        },
        {
            "binary_name": "libisccfg-export163",
            "binary_version": "1:9.11.16+dfsg-3~ubuntu1"
        },
        {
            "binary_name": "libisccfg163",
            "binary_version": "1:9.11.16+dfsg-3~ubuntu1"
        },
        {
            "binary_name": "liblwres161",
            "binary_version": "1:9.11.16+dfsg-3~ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5946.json"
Ubuntu:22.04:LTS
bind9

Package

Name
bind9
Purl
pkg:deb/ubuntu/bind9?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1:9.18.39-0ubuntu0.22.04.4

Affected versions

1:9.*
1:9.16.15-1ubuntu1
1:9.16.15-1ubuntu2
1:9.16.15-1ubuntu3
1:9.18.0-2ubuntu1
1:9.18.0-2ubuntu2
1:9.18.0-2ubuntu3
1:9.18.1-1ubuntu1
1:9.18.1-1ubuntu1.1
1:9.18.1-1ubuntu1.2
1:9.18.1-1ubuntu1.3
1:9.18.12-0ubuntu0.22.04.1
1:9.18.12-0ubuntu0.22.04.2
1:9.18.12-0ubuntu0.22.04.3
1:9.18.18-0ubuntu0.22.04.1
1:9.18.18-0ubuntu0.22.04.2
1:9.18.24-0ubuntu0.22.04.1
1:9.18.28-0ubuntu0.22.04.1
1:9.18.30-0ubuntu0.22.04.1
1:9.18.30-0ubuntu0.22.04.2
1:9.18.39-0ubuntu0.22.04.1
1:9.18.39-0ubuntu0.22.04.2
1:9.18.39-0ubuntu0.22.04.3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "bind9",
            "binary_version": "1:9.18.39-0ubuntu0.22.04.4"
        },
        {
            "binary_name": "bind9-dnsutils",
            "binary_version": "1:9.18.39-0ubuntu0.22.04.4"
        },
        {
            "binary_name": "bind9-host",
            "binary_version": "1:9.18.39-0ubuntu0.22.04.4"
        },
        {
            "binary_name": "bind9-libs",
            "binary_version": "1:9.18.39-0ubuntu0.22.04.4"
        },
        {
            "binary_name": "bind9-utils",
            "binary_version": "1:9.18.39-0ubuntu0.22.04.4"
        },
        {
            "binary_name": "bind9utils",
            "binary_version": "1:9.18.39-0ubuntu0.22.04.4"
        },
        {
            "binary_name": "dnsutils",
            "binary_version": "1:9.18.39-0ubuntu0.22.04.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5946.json"
bind9-libs

Package

Name
bind9-libs
Purl
pkg:deb/ubuntu/bind9-libs?arch=source&distro=jammy

Affected ranges

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

Affected versions

1:9.*
1:9.11.19+dfsg-2.1ubuntu1
1:9.11.19+dfsg-2.1ubuntu2
1:9.11.19+dfsg-2.1ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libbind9-161",
            "binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
        },
        {
            "binary_name": "libdns-export1110",
            "binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
        },
        {
            "binary_name": "libdns1110",
            "binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
        },
        {
            "binary_name": "libirs-export161",
            "binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
        },
        {
            "binary_name": "libirs161",
            "binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
        },
        {
            "binary_name": "libisc-export1105",
            "binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
        },
        {
            "binary_name": "libisc1105",
            "binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
        },
        {
            "binary_name": "libisccc-export161",
            "binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
        },
        {
            "binary_name": "libisccc161",
            "binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
        },
        {
            "binary_name": "libisccfg-export163",
            "binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
        },
        {
            "binary_name": "libisccfg163",
            "binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
        },
        {
            "binary_name": "liblwres161",
            "binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5946.json"
Ubuntu:24.04:LTS
bind9

Package

Name
bind9
Purl
pkg:deb/ubuntu/bind9?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1:9.18.39-0ubuntu0.24.04.5

Affected versions

1:9.*
1:9.18.18-0ubuntu2
1:9.18.21-0ubuntu1
1:9.18.24-0ubuntu3
1:9.18.24-0ubuntu4
1:9.18.24-0ubuntu5
1:9.18.28-0ubuntu0.24.04.1
1:9.18.30-0ubuntu0.24.04.1
1:9.18.30-0ubuntu0.24.04.2
1:9.18.39-0ubuntu0.24.04.1
1:9.18.39-0ubuntu0.24.04.2
1:9.18.39-0ubuntu0.24.04.3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "bind9",
            "binary_version": "1:9.18.39-0ubuntu0.24.04.5"
        },
        {
            "binary_name": "bind9-dnsutils",
            "binary_version": "1:9.18.39-0ubuntu0.24.04.5"
        },
        {
            "binary_name": "bind9-host",
            "binary_version": "1:9.18.39-0ubuntu0.24.04.5"
        },
        {
            "binary_name": "bind9-libs",
            "binary_version": "1:9.18.39-0ubuntu0.24.04.5"
        },
        {
            "binary_name": "bind9-utils",
            "binary_version": "1:9.18.39-0ubuntu0.24.04.5"
        },
        {
            "binary_name": "bind9utils",
            "binary_version": "1:9.18.39-0ubuntu0.24.04.5"
        },
        {
            "binary_name": "dnsutils",
            "binary_version": "1:9.18.39-0ubuntu0.24.04.5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5946.json"
Ubuntu:25.10
bind9

Package

Name
bind9
Purl
pkg:deb/ubuntu/bind9?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1:9.20.11-1ubuntu2.4

Affected versions

1:9.*
1:9.20.4-3ubuntu1
1:9.20.4-3ubuntu2
1:9.20.4-3ubuntu3
1:9.20.9-2ubuntu1
1:9.20.10-1ubuntu1
1:9.20.11-1ubuntu1
1:9.20.11-1ubuntu2
1:9.20.11-1ubuntu2.1
1:9.20.11-1ubuntu2.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "bind9",
            "binary_version": "1:9.20.11-1ubuntu2.4"
        },
        {
            "binary_name": "bind9-dnsutils",
            "binary_version": "1:9.20.11-1ubuntu2.4"
        },
        {
            "binary_name": "bind9-host",
            "binary_version": "1:9.20.11-1ubuntu2.4"
        },
        {
            "binary_name": "bind9-libs",
            "binary_version": "1:9.20.11-1ubuntu2.4"
        },
        {
            "binary_name": "bind9-utils",
            "binary_version": "1:9.20.11-1ubuntu2.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5946.json"
Ubuntu:26.04:LTS
bind9

Package

Name
bind9
Purl
pkg:deb/ubuntu/bind9?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1:9.20.18-1ubuntu2.1

Affected versions

1:9.*
1:9.20.11-1ubuntu2
1:9.20.11-1ubuntu3
1:9.20.18-1ubuntu1
1:9.20.18-1ubuntu2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "bind9",
            "binary_version": "1:9.20.18-1ubuntu2.1"
        },
        {
            "binary_name": "bind9-dnsutils",
            "binary_version": "1:9.20.18-1ubuntu2.1"
        },
        {
            "binary_name": "bind9-host",
            "binary_version": "1:9.20.18-1ubuntu2.1"
        },
        {
            "binary_name": "bind9-libs",
            "binary_version": "1:9.20.18-1ubuntu2.1"
        },
        {
            "binary_name": "bind9-utils",
            "binary_version": "1:9.20.18-1ubuntu2.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5946.json"
Ubuntu:Pro:18.04:LTS
bind9

Package

Name
bind9
Purl
pkg:deb/ubuntu/bind9?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1:9.11.3+dfsg-1ubuntu1.19+esm5

Affected versions

1:9.*
1:9.10.3.dfsg.P4-12.6ubuntu1
1:9.11.2.P1-1ubuntu2
1:9.11.2.P1-1ubuntu3
1:9.11.2.P1-1ubuntu4
1:9.11.2.P1-1ubuntu5
1:9.11.3+dfsg-1ubuntu1
1:9.11.3+dfsg-1ubuntu1.1
1:9.11.3+dfsg-1ubuntu1.2
1:9.11.3+dfsg-1ubuntu1.3
1:9.11.3+dfsg-1ubuntu1.5
1:9.11.3+dfsg-1ubuntu1.7
1:9.11.3+dfsg-1ubuntu1.8
1:9.11.3+dfsg-1ubuntu1.9
1:9.11.3+dfsg-1ubuntu1.10
1:9.11.3+dfsg-1ubuntu1.11
1:9.11.3+dfsg-1ubuntu1.12
1:9.11.3+dfsg-1ubuntu1.13
1:9.11.3+dfsg-1ubuntu1.14
1:9.11.3+dfsg-1ubuntu1.15
1:9.11.3+dfsg-1ubuntu1.16
1:9.11.3+dfsg-1ubuntu1.17
1:9.11.3+dfsg-1ubuntu1.18
1:9.11.3+dfsg-1ubuntu1.19+esm1
1:9.11.3+dfsg-1ubuntu1.19+esm2
1:9.11.3+dfsg-1ubuntu1.19+esm3
1:9.11.3+dfsg-1ubuntu1.19+esm4

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "bind9",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm5"
        },
        {
            "binary_name": "bind9-host",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm5"
        },
        {
            "binary_name": "bind9utils",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm5"
        },
        {
            "binary_name": "dnsutils",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm5"
        },
        {
            "binary_name": "libbind9-160",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm5"
        },
        {
            "binary_name": "libdns-export1100",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm5"
        },
        {
            "binary_name": "libdns1100",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm5"
        },
        {
            "binary_name": "libirs-export160",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm5"
        },
        {
            "binary_name": "libirs160",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm5"
        },
        {
            "binary_name": "libisc-export169",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm5"
        },
        {
            "binary_name": "libisc169",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm5"
        },
        {
            "binary_name": "libisccc-export160",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm5"
        },
        {
            "binary_name": "libisccc160",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm5"
        },
        {
            "binary_name": "libisccfg-export160",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm5"
        },
        {
            "binary_name": "libisccfg160",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm5"
        },
        {
            "binary_name": "liblwres160",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.19+esm5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5946.json"
Ubuntu:Pro:20.04:LTS
bind9

Package

Name
bind9
Purl
pkg:deb/ubuntu/bind9?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1:9.18.30-0ubuntu0.20.04.2+esm2

Affected versions

1:9.*
1:9.11.5.P4+dfsg-5.1ubuntu2
1:9.11.5.P4+dfsg-5.1ubuntu3
1:9.11.5.P4+dfsg-5.1ubuntu4
1:9.11.5.P4+dfsg-5.1ubuntu5
1:9.11.14+dfsg-1ubuntu1
1:9.11.14+dfsg-3ubuntu1
1:9.16.0-1ubuntu3
1:9.16.0-1ubuntu4
1:9.16.0-1ubuntu5
1:9.16.1-0ubuntu1
1:9.16.1-0ubuntu2
1:9.16.1-0ubuntu2.1
1:9.16.1-0ubuntu2.2
1:9.16.1-0ubuntu2.3
1:9.16.1-0ubuntu2.4
1:9.16.1-0ubuntu2.6
1:9.16.1-0ubuntu2.7
1:9.16.1-0ubuntu2.8
1:9.16.1-0ubuntu2.9
1:9.16.1-0ubuntu2.10
1:9.16.1-0ubuntu2.11
1:9.16.1-0ubuntu2.12
1:9.16.1-0ubuntu2.14
1:9.16.1-0ubuntu2.15
1:9.16.1-0ubuntu2.16
1:9.16.48-0ubuntu0.20.04.1
1:9.18.28-0ubuntu0.20.04.1
1:9.18.30-0ubuntu0.20.04.1
1:9.18.30-0ubuntu0.20.04.2
1:9.18.30-0ubuntu0.20.04.2+esm1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "bind9",
            "binary_version": "1:9.18.30-0ubuntu0.20.04.2+esm2"
        },
        {
            "binary_name": "bind9-dnsutils",
            "binary_version": "1:9.18.30-0ubuntu0.20.04.2+esm2"
        },
        {
            "binary_name": "bind9-host",
            "binary_version": "1:9.18.30-0ubuntu0.20.04.2+esm2"
        },
        {
            "binary_name": "bind9-libs",
            "binary_version": "1:9.18.30-0ubuntu0.20.04.2+esm2"
        },
        {
            "binary_name": "bind9-utils",
            "binary_version": "1:9.18.30-0ubuntu0.20.04.2+esm2"
        },
        {
            "binary_name": "bind9utils",
            "binary_version": "1:9.18.30-0ubuntu0.20.04.2+esm2"
        },
        {
            "binary_name": "dnsutils",
            "binary_version": "1:9.18.30-0ubuntu0.20.04.2+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5946.json"