Home / mailings [USN-6455-2] Exim regression
Posted on 10 June 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-6455-2
June 10, 2026
exim4 regression
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 22.04 LTS
Summary:
USN-6455-1 introduced a regression in Exim
Software Description:
- exim4: Exim is a mail transport agent
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)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 22.04 LTS
exim4 4.95-4ubuntu2.10
exim4-daemon-heavy 4.95-4ubuntu2.10
exim4-daemon-light 4.95-4ubuntu2.10
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-6455-2
https://ubuntu.com/security/notices/USN-6455-1
https://launchpad.net/bugs/2152830
Package Information:
https://launchpad.net/ubuntu/+source/exim4/4.95-4ubuntu2.10
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