Exim security advisory (AV26-944)
Canada's Cyber Centre warns Exim versions before 4.100.1 are vulnerable and urges administrators to update.
The Canadian Centre for Cyber Security issued advisory AV26-944 on 21 September 2026, stating that as of 18 September 2026 Exim versions before 4.100.1 are affected by vulnerabilities. The notice points administrators to Exim's 4.100.1 security release and urges them to apply available updates. It does not name CVE identifiers, describe the flaws, or say whether exploitation has been observed.
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