USN-8834-1

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Source
https://ubuntu.com/security/notices/USN-8834-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8834-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8834-1
Upstream
CVE (4)
Related
UBUNTU (4)
Published
2026-09-28T12:05:13Z
Modified
2026-09-28T17:42:48Z
Summary
exim4 vulnerabilities
Details

It was discovered that Exim had an out-of-bounds write when Proxy-Protocol was used with an attacker-controlled proxy. A remote attacker could possibly use this issue to execute arbitrary code. (CVE-2026-94054)

It was discovered that Exim had a use-after-free when certain non-default TLS settings were used with GnuTLS. A remote attacker could possibly use this issue to cause Exim to crash, resulting in a denial of service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-94055)

It was discovered that Exim allowed attackers to read uninitialized data from stack memory when Proxy-Protocol was used with an attacker-controlled proxy. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-94056)

It was discovered that Exim allowed SMTP smuggling via crafted data sent after a rejection during DATA processing. A remote attacker could possibly use this issue to inject arbitrary email messages. (CVE-2026-94057)

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
0 Unknown introduced version / All previous versions are affected
Fixed
4.95-4ubuntu2.12

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
4.95-4ubuntu2.9
4.95-4ubuntu2.10
4.95-4ubuntu2.11

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "exim4",
            "binary_version":  "4.95-4ubuntu2.12"
        },
        {
            "binary_name":  "exim4-base",
            "binary_version":  "4.95-4ubuntu2.12"
        },
        {
            "binary_name":  "exim4-config",
            "binary_version":  "4.95-4ubuntu2.12"
        },
        {
            "binary_name":  "exim4-daemon-heavy",
            "binary_version":  "4.95-4ubuntu2.12"
        },
        {
            "binary_name":  "exim4-daemon-light",
            "binary_version":  "4.95-4ubuntu2.12"
        },
        {
            "binary_name":  "eximon4",
            "binary_version":  "4.95-4ubuntu2.12"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-94054",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94056",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94057",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:22.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8834-1.json"

Ubuntu:24.04:LTS / exim4

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.97-4ubuntu4.8

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
4.97-4ubuntu4.6
4.97-4ubuntu4.7

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "exim4",
            "binary_version":  "4.97-4ubuntu4.8"
        },
        {
            "binary_name":  "exim4-base",
            "binary_version":  "4.97-4ubuntu4.8"
        },
        {
            "binary_name":  "exim4-config",
            "binary_version":  "4.97-4ubuntu4.8"
        },
        {
            "binary_name":  "exim4-daemon-heavy",
            "binary_version":  "4.97-4ubuntu4.8"
        },
        {
            "binary_name":  "exim4-daemon-light",
            "binary_version":  "4.97-4ubuntu4.8"
        },
        {
            "binary_name":  "eximon4",
            "binary_version":  "4.97-4ubuntu4.8"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-94054",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94056",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94057",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:24.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8834-1.json"

Ubuntu:26.04:LTS / exim4

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.99.1-1ubuntu1.5

Affected versions

4.*
4.98.2-1ubuntu2
4.99-4ubuntu1
4.99.1-1ubuntu1
4.99.1-1ubuntu1.1
4.99.1-1ubuntu1.2
4.99.1-1ubuntu1.3
4.99.1-1ubuntu1.4

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "exim4",
            "binary_version":  "4.99.1-1ubuntu1.5"
        },
        {
            "binary_name":  "exim4-base",
            "binary_version":  "4.99.1-1ubuntu1.5"
        },
        {
            "binary_name":  "exim4-config",
            "binary_version":  "4.99.1-1ubuntu1.5"
        },
        {
            "binary_name":  "exim4-daemon-heavy",
            "binary_version":  "4.99.1-1ubuntu1.5"
        },
        {
            "binary_name":  "exim4-daemon-light",
            "binary_version":  "4.99.1-1ubuntu1.5"
        },
        {
            "binary_name":  "eximon4",
            "binary_version":  "4.99.1-1ubuntu1.5"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-94054",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94055",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94056",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94057",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:26.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8834-1.json"