UBUNTU-CVE-2026-27852

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-27852
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27852.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-27852
Upstream
  • CVE-2026-27852
Published
2026-08-28T00:00:00Z
Modified
2026-09-02T19:36:03Z
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
  • Ubuntu - medium
Summary
[none]
Details

An attacker that can send mail to a user can craft a message whose headers contain a very large number of email addresses or MIME parameters, which causes excessive memory usage when the message is later parsed. The message is still delivered, but reading it over IMAP can exhaust the memory limit of the process and terminate it, causing denial of service for the affected user. Update to non-vulnerable 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
0 Unknown 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-2026-27852.json"
Ubuntu:18.04:LTS
dovecot

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-27852.json"
Ubuntu:20.04:LTS
dovecot

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-27852.json"
Ubuntu:22.04:LTS
dovecot

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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_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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27852.json"
Ubuntu:24.04:LTS
dovecot

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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_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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27852.json"
Ubuntu:26.04:LTS
dovecot

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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_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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27852.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
0 Unknown 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-2026-27852.json"