UBUNTU-CVE-2026-33603

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Source
https://ubuntu.com/security/CVE-2026-33603
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33603.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-33603
Upstream
Downstream
Related
Published
2026-05-12T14:17:00Z
Modified
2026-06-02T16:00:16.792845439Z
Severity
  • 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel binding. This requires that the attacker is able to position itself between Dovecot and the client connection. If successful, the attacker can eavesdrop communications between Dovecot and client as MITM proxy. Install fixed version. No publicly available exploits are known.

References

Affected packages

Ubuntu:16.04:LTS
dovecot

Package

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

Affected ranges

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

Affected versions

1:2.*
1:2.2.18-2ubuntu2
1:2.2.22-1ubuntu1
1:2.2.22-1ubuntu2
1:2.2.22-1ubuntu2.1
1:2.2.22-1ubuntu2.2
1:2.2.22-1ubuntu2.3
1:2.2.22-1ubuntu2.4
1:2.2.22-1ubuntu2.6
1:2.2.22-1ubuntu2.7
1:2.2.22-1ubuntu2.8
1:2.2.22-1ubuntu2.9
1:2.2.22-1ubuntu2.10
1:2.2.22-1ubuntu2.11
1:2.2.22-1ubuntu2.12
1:2.2.22-1ubuntu2.13
1:2.2.22-1ubuntu2.14

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name": "dovecot-lucene",
            "binary_version": "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name": "mail-stack-delivery",
            "binary_version": "1:2.2.22-1ubuntu2.14"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33603.json"
Ubuntu:18.04:LTS
dovecot

Package

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

Affected ranges

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

Affected versions

1:2.*
1:2.2.27-3ubuntu1
1:2.2.33.2-1ubuntu1
1:2.2.33.2-1ubuntu2
1:2.2.33.2-1ubuntu3
1:2.2.33.2-1ubuntu4
1:2.2.33.2-1ubuntu4.1
1:2.2.33.2-1ubuntu4.2
1:2.2.33.2-1ubuntu4.3
1:2.2.33.2-1ubuntu4.4
1:2.2.33.2-1ubuntu4.5
1:2.2.33.2-1ubuntu4.6
1:2.2.33.2-1ubuntu4.7
1:2.2.33.2-1ubuntu4.8

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name": "mail-stack-delivery",
            "binary_version": "1:2.2.33.2-1ubuntu4.8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33603.json"
Ubuntu:20.04:LTS
dovecot

Package

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

Affected ranges

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

Affected versions

1:2.*
1:2.3.4.1-5ubuntu3
1:2.3.7.2-1ubuntu1
1:2.3.7.2-1ubuntu2
1:2.3.7.2-1ubuntu3
1:2.3.7.2-1ubuntu3.1
1:2.3.7.2-1ubuntu3.2
1:2.3.7.2-1ubuntu3.3
1:2.3.7.2-1ubuntu3.4
1:2.3.7.2-1ubuntu3.5
1:2.3.7.2-1ubuntu3.6
1:2.3.7.2-1ubuntu3.7

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dovecot-auth-lua",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name": "dovecot-lucene",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name": "dovecot-submissiond",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name": "mail-stack-delivery",
            "binary_version": "1:2.3.7.2-1ubuntu3.7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33603.json"
Ubuntu:22.04:LTS
dovecot

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:2.3.16+dfsg1-3ubuntu2.9

Affected versions

1:2.*
1:2.3.13+dfsg1-1ubuntu3
1:2.3.16+dfsg1-3ubuntu1
1:2.3.16+dfsg1-3ubuntu2
1:2.3.16+dfsg1-3ubuntu2.1
1:2.3.16+dfsg1-3ubuntu2.2
1:2.3.16+dfsg1-3ubuntu2.4
1:2.3.16+dfsg1-3ubuntu2.6
1:2.3.16+dfsg1-3ubuntu2.7
1:2.3.16+dfsg1-3ubuntu2.8

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dovecot-auth-lua",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name": "dovecot-lucene",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name": "dovecot-submissiond",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33603.json"
Ubuntu:24.04:LTS
dovecot

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:2.3.21+dfsg1-2ubuntu6.5

Affected versions

1:2.*
1:2.3.20+dfsg1-1ubuntu3
1:2.3.21+dfsg1-2ubuntu1
1:2.3.21+dfsg1-2ubuntu2
1:2.3.21+dfsg1-2ubuntu4
1:2.3.21+dfsg1-2ubuntu5
1:2.3.21+dfsg1-2ubuntu6
1:2.3.21+dfsg1-2ubuntu6.1
1:2.3.21+dfsg1-2ubuntu6.2
1:2.3.21+dfsg1-2ubuntu6.3
1:2.3.21+dfsg1-2ubuntu6.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dovecot-auth-lua",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name": "dovecot-submissiond",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33603.json"
Ubuntu:25.10
dovecot

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:2.4.1+dfsg1-5ubuntu4.2

Affected versions

1:2.*
1:2.3.21.1+dfsg1-1ubuntu2
1:2.4.1+dfsg1-5ubuntu1
1:2.4.1+dfsg1-5ubuntu3
1:2.4.1+dfsg1-5ubuntu4
1:2.4.1+dfsg1-5ubuntu4.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dovecot-auth-lua",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.2"
        },
        {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.2"
        },
        {
            "binary_name": "dovecot-flatcurve",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.2"
        },
        {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.2"
        },
        {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.2"
        },
        {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.2"
        },
        {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.2"
        },
        {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.2"
        },
        {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.2"
        },
        {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.2"
        },
        {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.2"
        },
        {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.2"
        },
        {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.2"
        },
        {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.2"
        },
        {
            "binary_name": "dovecot-submissiond",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.2"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33603.json"
Ubuntu:26.04:LTS
dovecot

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:2.4.2+dfsg1-3ubuntu2.1

Affected versions

1:2.*
1:2.4.1+dfsg1-5ubuntu4
1:2.4.1+dfsg1-5ubuntu5
1:2.4.2+dfsg1-3ubuntu1
1:2.4.2+dfsg1-3ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dovecot-auth-lua",
            "binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name": "dovecot-flatcurve",
            "binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name": "dovecot-submissiond",
            "binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33603.json"
Ubuntu:Pro:14.04:LTS
dovecot

Package

Name
dovecot
Purl
pkg:deb/ubuntu/dovecot?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

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

Affected versions

1:2.*
1:2.1.7-7ubuntu3
1:2.2.9-1ubuntu1
1:2.2.9-1ubuntu2
1:2.2.9-1ubuntu2.1
1:2.2.9-1ubuntu2.3
1:2.2.9-1ubuntu2.4
1:2.2.9-1ubuntu2.5
1:2.2.9-1ubuntu2.6
1:2.2.9-1ubuntu2.6+esm1
1:2.2.9-1ubuntu2.6+esm2
1:2.2.9-1ubuntu2.6+esm3
1:2.2.9-1ubuntu2.6+esm4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name": "mail-stack-delivery",
            "binary_version": "1:2.2.9-1ubuntu2.6+esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33603.json"