USN-6455-2

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Source
https://ubuntu.com/security/notices/USN-6455-2
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6455-2.json
JSON Data
https://api.osv.dev/v1/vulns/USN-6455-2
Related
Published
2026-06-10T12:22:10Z
Modified
2026-06-10T18:29:40.119756175Z
Summary
exim4 regression
Details

USN-6455-1 fixed vulnerabilities in Exim. The fix for CVE-2023-42117 introduced a regression on Ubuntu 22.04 LTS that resulted in certain connections logging a Taint mismatch error. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that Exim incorrectly handled validation of user-supplied data, which could lead to memory corruption. A remote attacker could possibly use this issue to execute arbitrary code. (CVE-2023-42117)

It was discovered that Exim incorrectly handled validation of user-supplied data, which could lead to an out-of-bounds read. An attacker could possibly use this issue to expose sensitive information. (CVE-2023-42119)

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
4.95-4ubuntu2.10

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "exim4",
            "binary_version": "4.95-4ubuntu2.10"
        },
        {
            "binary_name": "exim4-base",
            "binary_version": "4.95-4ubuntu2.10"
        },
        {
            "binary_name": "exim4-config",
            "binary_version": "4.95-4ubuntu2.10"
        },
        {
            "binary_name": "exim4-daemon-heavy",
            "binary_version": "4.95-4ubuntu2.10"
        },
        {
            "binary_name": "exim4-daemon-light",
            "binary_version": "4.95-4ubuntu2.10"
        },
        {
            "binary_name": "eximon4",
            "binary_version": "4.95-4ubuntu2.10"
        }
    ]
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:22.04:LTS",
    "cves": []
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6455-2.json"