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Fedora 42 Exim Important Security Fix Advisory 2026

Linuxsecurity •LinuxSecurity Advisories • May 10, 2026

Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet. It is freely available under the terms of the GNU General Public Licence. In style it is similar to Smail 3, but its facilities are more general. There is a great deal of flexibility in the way mail can be routed, and there are extensive facilities for checking incoming mail. Exim can be installed in place of sendmail, although the configuration of exim is quite different to that of sendmail. Update Information : This is new version of exim fixing some security bugs.

Exim is a message transfer agent (MTA) developed at the University of

Cambridge for use on Unix systems connected to the Internet. It is

freely available under the terms of the GNU General Public Licence. In

style it is similar to Smail 3, but its facilities are more

general. There is a great deal of flexibility in the way mail can be

routed, and there are extensive facilities for checking incoming

mail. Exim can be installed in place of sendmail, although the

configuration of exim is quite different to that of sendmail.

This is new version of exim fixing some security bugs.

* Thu Apr 30 2026 Jaroslav \u0160karvada - 4.99.2-1 - New version Resolves: rhbz#2463798 - Refreshed keyring * Mon Jan 19 2026 Jaroslav \u0160karvada - 4.99.1-3 - Dummy rebuild to check the CI functionality * Fri Jan 16 2026 Fedora Release Engineering - 4.99.1-2 - Rebuilt for

[ 1 ] Bug #2463798 - exim-4.99.2 is available

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-fff37fe569' at the command line. For more information, refer to the dnf documentation available at

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Fedora 42 and 43 Exim Security Updates Address Vulnerabilities On May 10, 2026, security advisories were released for Exim versions in Fedora 42 and 43, addressing critical security vulnerabilities. The updates, identified as version 4.99.2-1, resolve multiple security bugs affecting the Exim message transfer agent, which is widely used on Unix systems. Users of Fedora 42 and 43 are urged to upgrade to the latest version to mitigate potential risks. The vulnerabilities could allow unauthorized access or manipulation of email routing, posing a significant threat to system integrity. The updates can be installed using the 'dnf' package manager with specific commands provided in the advisories. System administrators are recommended to apply these updates promptly to ensure security. 2 sources 58

Fedora 42 Exim Important Security Fix Advisory 2026

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