New critical Exim mailer flaw allows remote code execution

A critical vulnerability affecting certain configurations of the Exim open-source mail transfer agent could be exploited by an unauthenticated remote attacker to execute arbitrary code.

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Active exploitation / in-the-wild language detected — floor raised to at least high.

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https://www.bleepingcomputer.com/news/security/new-critical-exim-mailer-flaw-allows-remote-code-execution/

Curated May 13, 2026 by Aidan Duffy, Threat intelligence editor, AHackaday./Methodology/Sources verified.

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