UBUNTU-CVE-2026-33607

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Source
https://ubuntu.com/security/CVE-2026-33607
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33607.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-33607
Upstream
  • CVE-2026-33607
Published
2026-08-28T00:00:00Z
Modified
2026-09-02T19:34:45.646318915Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

An attacker that has valid credentials can use IMAP LIST command to consume CPU. This can cause degradation or denial of service for IMAP. Monitor system for abnormal CPU usage and kill the offending process and lock account. Alternatively 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_version": "1:2.2.22-1ubuntu2.14",
            "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33607.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_version": "1:2.2.33.2-1ubuntu4.8",
            "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33607.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_version": "1:2.3.7.2-1ubuntu3.7",
            "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33607.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

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
1:2.3.16+dfsg1-3ubuntu2.9

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.9",
            "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33607.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

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
1:2.3.21+dfsg1-2ubuntu6.5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.5",
            "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33607.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

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
1:2.4.2+dfsg1-3ubuntu2.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1:2.4.2+dfsg1-3ubuntu2.1",
            "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33607.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_version": "1:2.2.9-1ubuntu2.6+esm4",
            "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33607.json"