CVE-2026-53533 | cole aiosmtplib up to 5.1.0 Address SMTP.mail/SMTP.rcpt/SMTP.vrfy/SMTP.expn command injection

August 18, 2026 Yanac

A vulnerability identified as critical has been detected in cole aiosmtplib up to 5.1.0. This affects the function SMTP.mail/SMTP.rcpt/SMTP.vrfy/SMTP.expn of the component Address Handler. The manipulation leads to command injection.

This vulnerability is listed as CVE-2026-53533. The attack may be initiated remotely. There is no available exploit.

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