========================================================================== Ubuntu Security Notice USN-8253-1 May 07, 2026
postfix vulnerability ========================================================================== 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: Postfix could be made to crash if it received specially crafted network traffic. Software Description: - postfix: High-performance mail transport agent Details: Kamil Frankowicz discovered that Postfix incorrectly handled certain enhanced status codes. A remote attacker could possibly use this issue to cause Postfix to crash, resulting in a denial of service. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS postfix 3.10.6-4ubuntu2.1 Ubuntu 25.10 postfix 3.10.2-1ubuntu2.1 Ubuntu 24.04 LTS postfix 3.8.6-1ubuntu0.1 Ubuntu 22.04 LTS postfix 3.6.4-1ubuntu1.4 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8253-1 CVE-2026-43964 Package Information: https://launchpad.net/ubuntu/+source/postfix/3.10.6-4ubuntu2.1 https://launchpad.net/ubuntu/+source/postfix/3.10.2-1ubuntu2.1 https://launchpad.net/ubuntu/+source/postfix/3.8.6-1ubuntu0.1 https://launchpad.net/ubuntu/+source/postfix/3.6.4-1ubuntu1.4
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