UBUNTU-CVE-2026-42007

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Source
https://ubuntu.com/security/CVE-2026-42007
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42007.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-42007
Upstream
  • CVE-2026-42007
Published
2026-08-28T00:00:00Z
Modified
2026-09-02T19:35:44.822449947Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

An attacker that has valid credentials can use a Sieve script with the editheader extension to trigger a use-after-free in the mail editing code, and to write memory contents beyond the intended buffer into the delivered mail. This causes memory leak and opportunity to do memory corruption during mail delivery, which can crash the delivery process and may allow execution of arbitrary code in the context of that process. Disable the Sieve editheader extension. 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
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-2026-42007.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-2026-42007.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-2026-42007.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-2026-42007.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-2026-42007.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-2026-42007.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-2026-42007.json"