USN-8353-1

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Source
https://ubuntu.com/security/notices/USN-8353-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8353-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8353-1
Upstream
Related
Published
2026-06-01T13:24:28Z
Modified
2026-06-01T19:14:33.859974809Z
Summary
exim4 vulnerability
Details

Warisjeet Singh discovered that Exim with SUPPORT_PROXY enabled did not properly handle memory before SMTP authentication. A remote attacker could possibly use this issue to obtain sensitive information.

References

Affected packages

Ubuntu:22.04:LTS / exim4

Package

Name
exim4
Purl
pkg:deb/ubuntu/exim4?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.95-4ubuntu2.9

Affected versions

4.*
4.94.2-7ubuntu2
4.95-2ubuntu2
4.95-4ubuntu1
4.95-4ubuntu2
4.95-4ubuntu2.1
4.95-4ubuntu2.2
4.95-4ubuntu2.3
4.95-4ubuntu2.4
4.95-4ubuntu2.5
4.95-4ubuntu2.6
4.95-4ubuntu2.7
4.95-4ubuntu2.8

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "4.95-4ubuntu2.9",
            "binary_name": "exim4"
        },
        {
            "binary_version": "4.95-4ubuntu2.9",
            "binary_name": "exim4-base"
        },
        {
            "binary_version": "4.95-4ubuntu2.9",
            "binary_name": "exim4-config"
        },
        {
            "binary_version": "4.95-4ubuntu2.9",
            "binary_name": "exim4-daemon-heavy"
        },
        {
            "binary_version": "4.95-4ubuntu2.9",
            "binary_name": "exim4-daemon-light"
        },
        {
            "binary_version": "4.95-4ubuntu2.9",
            "binary_name": "eximon4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8353-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:22.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-48840",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}

Ubuntu:24.04:LTS / exim4

Package

Name
exim4
Purl
pkg:deb/ubuntu/exim4?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.97-4ubuntu4.6

Affected versions

4.*
4.96-17ubuntu2
4.96-17ubuntu2.1
4.97-3ubuntu1
4.97-4ubuntu1
4.97-4ubuntu3
4.97-4ubuntu4
4.97-4ubuntu4.1
4.97-4ubuntu4.2
4.97-4ubuntu4.3
4.97-4ubuntu4.4
4.97-4ubuntu4.5

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "4.97-4ubuntu4.6",
            "binary_name": "exim4"
        },
        {
            "binary_version": "4.97-4ubuntu4.6",
            "binary_name": "exim4-base"
        },
        {
            "binary_version": "4.97-4ubuntu4.6",
            "binary_name": "exim4-config"
        },
        {
            "binary_version": "4.97-4ubuntu4.6",
            "binary_name": "exim4-daemon-heavy"
        },
        {
            "binary_version": "4.97-4ubuntu4.6",
            "binary_name": "exim4-daemon-light"
        },
        {
            "binary_version": "4.97-4ubuntu4.6",
            "binary_name": "eximon4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8353-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:24.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-48840",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}

Ubuntu:25.10 / exim4

Package

Name
exim4
Purl
pkg:deb/ubuntu/exim4?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.98.2-1ubuntu2.3

Affected versions

4.*
4.98.1-1ubuntu2
4.98.2-1ubuntu1
4.98.2-1ubuntu2
4.98.2-1ubuntu2.1
4.98.2-1ubuntu2.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "4.98.2-1ubuntu2.3",
            "binary_name": "exim4"
        },
        {
            "binary_version": "4.98.2-1ubuntu2.3",
            "binary_name": "exim4-base"
        },
        {
            "binary_version": "4.98.2-1ubuntu2.3",
            "binary_name": "exim4-config"
        },
        {
            "binary_version": "4.98.2-1ubuntu2.3",
            "binary_name": "exim4-daemon-heavy"
        },
        {
            "binary_version": "4.98.2-1ubuntu2.3",
            "binary_name": "exim4-daemon-light"
        },
        {
            "binary_version": "4.98.2-1ubuntu2.3",
            "binary_name": "eximon4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8353-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:25.10",
    "cves": [
        {
            "id": "CVE-2026-48840",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}

Ubuntu:26.04:LTS / exim4

Package

Name
exim4
Purl
pkg:deb/ubuntu/exim4?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.99.1-1ubuntu1.3

Affected versions

4.*
4.98.2-1ubuntu2
4.99-4ubuntu1
4.99.1-1ubuntu1
4.99.1-1ubuntu1.1
4.99.1-1ubuntu1.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "4.99.1-1ubuntu1.3",
            "binary_name": "exim4"
        },
        {
            "binary_version": "4.99.1-1ubuntu1.3",
            "binary_name": "exim4-base"
        },
        {
            "binary_version": "4.99.1-1ubuntu1.3",
            "binary_name": "exim4-config"
        },
        {
            "binary_version": "4.99.1-1ubuntu1.3",
            "binary_name": "exim4-daemon-heavy"
        },
        {
            "binary_version": "4.99.1-1ubuntu1.3",
            "binary_name": "exim4-daemon-light"
        },
        {
            "binary_version": "4.99.1-1ubuntu1.3",
            "binary_name": "eximon4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8353-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:26.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-48840",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}