UBUNTU-CVE-2026-48840

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Source

https://ubuntu.com/security/CVE-2026-48840

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48840.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-48840

Upstream

CVE-2026-48840

Downstream

USN-8353-1

USN-8382-1

Related

Published

2026-05-29T14:00:00Z

Modified

2026-06-04T02:14:19.174228855Z

Severity

5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

Exim 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosure of uninitialized stack memory values to a client.

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_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",
            "binary_version": "4.95-4ubuntu2.9"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48840.json"

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_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",
            "binary_version": "4.97-4ubuntu4.6"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48840.json"

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_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",
            "binary_version": "4.98.2-1ubuntu2.3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48840.json"

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_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",
            "binary_version": "4.99.1-1ubuntu1.3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48840.json"

Ubuntu:Pro:16.04:LTS

exim4

Package

Name: exim4
Purl: pkg:deb/ubuntu/exim4?arch=source&distro=esm-infra-legacy%2Fxenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

4.86.2-2ubuntu2.6+esm9

Affected versions

4.*

4.86-3ubuntu1

4.86-7ubuntu1

4.86-7ubuntu2

4.86-7ubuntu3

4.86.2-2ubuntu1

4.86.2-2ubuntu2

4.86.2-2ubuntu2.1

4.86.2-2ubuntu2.2

4.86.2-2ubuntu2.3

4.86.2-2ubuntu2.4

4.86.2-2ubuntu2.5

4.86.2-2ubuntu2.6

4.86.2-2ubuntu2.6+esm1

4.86.2-2ubuntu2.6+esm2

4.86.2-2ubuntu2.6+esm4

4.86.2-2ubuntu2.6+esm5

4.86.2-2ubuntu2.6+esm6

4.86.2-2ubuntu2.6+esm7

4.86.2-2ubuntu2.6+esm8

Ecosystem specific

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "exim4",
            "binary_version": "4.86.2-2ubuntu2.6+esm9"
        },
        {
            "binary_name": "exim4-base",
            "binary_version": "4.86.2-2ubuntu2.6+esm9"
        },
        {
            "binary_name": "exim4-config",
            "binary_version": "4.86.2-2ubuntu2.6+esm9"
        },
        {
            "binary_name": "exim4-daemon-heavy",
            "binary_version": "4.86.2-2ubuntu2.6+esm9"
        },
        {
            "binary_name": "exim4-daemon-light",
            "binary_version": "4.86.2-2ubuntu2.6+esm9"
        },
        {
            "binary_name": "eximon4",
            "binary_version": "4.86.2-2ubuntu2.6+esm9"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48840.json"

Ubuntu:Pro:18.04:LTS

exim4

Package

Name: exim4
Purl: pkg:deb/ubuntu/exim4?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

4.90.1-1ubuntu1.10+esm6

Affected versions

4.*

4.89-5ubuntu1

4.89-9ubuntu1

4.89-9ubuntu2

4.89-9ubuntu3

4.89-9ubuntu4

4.90.1-1ubuntu1

4.90.1-1ubuntu1.1

4.90.1-1ubuntu1.2

4.90.1-1ubuntu1.3

4.90.1-1ubuntu1.4

4.90.1-1ubuntu1.5

4.90.1-1ubuntu1.8

4.90.1-1ubuntu1.9

4.90.1-1ubuntu1.10

4.90.1-1ubuntu1.10+esm1

4.90.1-1ubuntu1.10+esm2

4.90.1-1ubuntu1.10+esm3

4.90.1-1ubuntu1.10+esm4

4.90.1-1ubuntu1.10+esm5

Ecosystem specific

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "exim4",
            "binary_version": "4.90.1-1ubuntu1.10+esm6"
        },
        {
            "binary_name": "exim4-base",
            "binary_version": "4.90.1-1ubuntu1.10+esm6"
        },
        {
            "binary_name": "exim4-config",
            "binary_version": "4.90.1-1ubuntu1.10+esm6"
        },
        {
            "binary_name": "exim4-daemon-heavy",
            "binary_version": "4.90.1-1ubuntu1.10+esm6"
        },
        {
            "binary_name": "exim4-daemon-light",
            "binary_version": "4.90.1-1ubuntu1.10+esm6"
        },
        {
            "binary_name": "eximon4",
            "binary_version": "4.90.1-1ubuntu1.10+esm6"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48840.json"

Ubuntu:Pro:20.04:LTS

exim4

Package

Name: exim4
Purl: pkg:deb/ubuntu/exim4?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

4.93-13ubuntu1.12+esm1

Affected versions

4.*

4.92.1-1ubuntu3

4.92.1-1ubuntu4

4.93~RC2-1ubuntu1

4.93-9ubuntu1

4.93-11ubuntu1

4.93-12ubuntu1

4.93-13ubuntu1

4.93-13ubuntu1.1

4.93-13ubuntu1.5

4.93-13ubuntu1.6

4.93-13ubuntu1.7

4.93-13ubuntu1.8

4.93-13ubuntu1.9

4.93-13ubuntu1.10

4.93-13ubuntu1.11

4.93-13ubuntu1.12

Ecosystem specific

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "exim4",
            "binary_version": "4.93-13ubuntu1.12+esm1"
        },
        {
            "binary_name": "exim4-base",
            "binary_version": "4.93-13ubuntu1.12+esm1"
        },
        {
            "binary_name": "exim4-config",
            "binary_version": "4.93-13ubuntu1.12+esm1"
        },
        {
            "binary_name": "exim4-daemon-heavy",
            "binary_version": "4.93-13ubuntu1.12+esm1"
        },
        {
            "binary_name": "exim4-daemon-light",
            "binary_version": "4.93-13ubuntu1.12+esm1"
        },
        {
            "binary_name": "eximon4",
            "binary_version": "4.93-13ubuntu1.12+esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48840.json"