CVE-2026-53533

CVE-2026-53533 · aiosmtplib: SMTP command injection via CR/LF in sender/recipient address

Cette page présente des faits issus de sources publiques. Consultez l’avis original avant toute mise à jour.

aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior to 5.1.1, SMTP.mail(), SMTP.rcpt(), SMTP.vrfy(), and SMTP.expn() send caller-supplied addresses without rejecting embedded CR or LF bytes. Data after the line break is framed as additional standalone SMTP command lines, allowing an attacker who influences an envelope sender or recipient to inject commands such as MAIL FROM, RCPT TO, RSET, DATA, or AUTH. SMTP.sendmail() and SMTP.send() without a Message object pass addresses through the affected methods, while SMTP.send_message() is not affected. Successful injection can desynchronize the command-response pipeline, hang the SMTP instance, or send an arbitrary message without requiring attacker control of the SMTP server. This issue is fixed in version 5.1.1.

CVSS 6.9 · Moyenne · EPSS 0,5% · Correctif disponible

Publication

2026-08-18T17:54:23.124Z

Mise à jour

2026-08-19T18:21:20.334Z

Pile logicielle: system · python

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