USN-9013-1

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Source
https://ubuntu.com/security/notices/USN-9013-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9013-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-9013-1
Upstream
CVE (3)
Published
2026-11-09T17:17:55Z
Modified
2026-11-10T02:58:35Z
Summary
fetchmail vulnerabilities
Details

Christian Herdtweck discovered that Fetchmail incorrectly handled certain long log messages. A remote attacker could possibly use this issue to cause Fetchmail to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2021-36386)

It was discovered that the Fetchmail SMTP client incorrectly handled certain status code messages. An attacker controlling a malicious server could possibly use this issue to cause Fetchmail to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2025-61962)

Tristan Madani discovered that Fetchmail incorrectly handled certain NTLM authentication challenges. A remote attacker could possibly use this issue to cause Fetchmail to crash, resulting in a denial of service, or possibly execute arbitrary code. The default compiler options for affected releases should reduce the vulnerability to a denial of service. (CVE-2026-94184)

References

Affected packages

Ubuntu:22.04:LTS
fetchmail

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
6.4.27-1ubuntu0.2

Affected versions

6.*
6.4.22-1
6.4.23-1
6.4.24-1
6.4.25-1
6.4.26-1
6.4.27-1
6.4.27-1ubuntu0.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "fetchmail",
            "binary_version": "6.4.27-1ubuntu0.2"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [],
    "ecosystem": "Ubuntu:22.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9013-1.json"
Ubuntu:24.04:LTS
fetchmail

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
6.4.38-1ubuntu4.2

Affected versions

6.*
6.4.37-1
6.4.38-1ubuntu1
6.4.38-1ubuntu3
6.4.38-1ubuntu4
6.4.38-1ubuntu4.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "fetchmail",
            "binary_version": "6.4.38-1ubuntu4.2"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [],
    "ecosystem": "Ubuntu:24.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9013-1.json"
Ubuntu:26.04:LTS
fetchmail

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
6.6.2-2ubuntu0.1

Affected versions

6.*
6.5.4-0ubuntu2
6.5.4-0ubuntu3
6.6.2-2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "fetchmail",
            "binary_version": "6.6.2-2ubuntu0.1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [],
    "ecosystem": "Ubuntu:26.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9013-1.json"
Ubuntu:26.10
fetchmail

Package

Name
fetchmail
Purl
pkg:deb/ubuntu/fetchmail?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
6.6.6-1ubuntu0.1

Affected versions

6.*
6.6.2-2
6.6.3-3
6.6.6-1
6.6.6-1build1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "fetchmail",
            "binary_version": "6.6.6-1ubuntu0.1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [],
    "ecosystem": "Ubuntu:26.10"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9013-1.json"
Ubuntu:Pro:16.04:LTS
fetchmail

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
6.3.26-2ubuntu0.1~esm1

Affected versions

6.*
6.3.26-1
6.3.26-2

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "fetchmail",
            "binary_version": "6.3.26-2ubuntu0.1~esm1"
        },
        {
            "binary_name": "fetchmailconf",
            "binary_version": "6.3.26-2ubuntu0.1~esm1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [],
    "ecosystem": "Ubuntu:Pro:16.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9013-1.json"
Ubuntu:Pro:18.04:LTS
fetchmail

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
6.3.26-3ubuntu0.1~18.04.1+esm1

Affected versions

6.*
6.3.26-3
6.3.26-3build1
6.3.26-3ubuntu0.1~18.04.1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "fetchmail",
            "binary_version": "6.3.26-3ubuntu0.1~18.04.1+esm1"
        },
        {
            "binary_name": "fetchmailconf",
            "binary_version": "6.3.26-3ubuntu0.1~18.04.1+esm1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [],
    "ecosystem": "Ubuntu:Pro:18.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9013-1.json"
Ubuntu:Pro:20.04:LTS
fetchmail

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
6.4.2-2ubuntu0.1~esm1

Affected versions

6.*
6.4.0~rc4-1ubuntu1
6.4.1-1ubuntu1
6.4.2-2

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "fetchmail",
            "binary_version": "6.4.2-2ubuntu0.1~esm1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [],
    "ecosystem": "Ubuntu:Pro:20.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9013-1.json"