========================================================================== Ubuntu Security Notice USN-8228-1 May 04, 2026
exim4 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 LTS - Ubuntu 25.10 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: Several security issues were fixed in Exim. Software Description: - exim4: Exim is a mail transport agent Details: It was discovered that Exim incorrectly handled parsing malformed JSON in message headers. A remote attacker could possibly use this issue to execute arbitrary code. (CVE-2026-40685) It was discovered that Exim incorrectly handled processing of UTF-8 trailing characters. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-40686) It was discovered that Exim incorrectly handled SPA authenticator input. An authenticated user could possibly use this issue to execute arbitrary code. (CVE-2026-40687) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS exim4 4.99.1-1ubuntu1.1 exim4-base 4.99.1-1ubuntu1.1 eximon4 4.99.1-1ubuntu1.1 Ubuntu 25.10 exim4 4.98.2-1ubuntu2.1 exim4-base 4.98.2-1ubuntu2.1 eximon4 4.98.2-1ubuntu2.1 Ubuntu 24.04 LTS exim4 4.97-4ubuntu4.4 exim4-base 4.97-4ubuntu4.4 eximon4 4.97-4ubuntu4.4 Ubuntu 22.04 LTS exim4 4.95-4ubuntu2.7 exim4-base 4.95-4ubuntu2.7 eximon4 4.95-4ubuntu2.7 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8228-1 CVE-2026-40685, CVE-2026-40686, CVE-2026-40687 Package Information: https://launchpad.net/ubuntu/+source/exim4/4.99.1-1ubuntu1.1 https://launchpad.net/ubuntu/+source/exim4/4.98.2-1ubuntu2.1 https://launchpad.net/ubuntu/+source/exim4/4.97-4ubuntu4.4 https://launchpad.net/ubuntu/+source/exim4/4.95-4ubuntu2.7
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