UBUNTU-CVE-2026-53533

aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior...

CVE-2026-53533

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...

CVE-2026-53533

aiosmtplib's SMTP.mail(), SMTP.rcpt(), SMTP.vrfy(), and SMTP.expn() methods transmit caller-supplied addresses without filtering CR/LF bytes, allowing SMTP command injection (CWE-93/CWE-77) when attacker-influenced addresses are passed. This enables desynchronization, client hangs, or arbitrary m...

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

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...

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

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...

aiosmtplib vulnerable to SMTP command injection via CR/LF in sender/recipient address

Summaryaiosmtplib's SMTP.mail, SMTP.rcpt, SMTP.vrfy and SMTP.expn send the caller-supplied email address to the server without rejecting embedded CR/LF \r\n bytes. An address that contains a CR/LF is written verbatim onto the SMTP control connection, so the bytes after the CRLF are framed by the...

PYSEC-2026-2338 aiosmtplib vulnerable to SMTP command injection via CR/LF in sender/recipient address

Summary aiosmtplib's SMTP.mail, SMTP.rcpt, SMTP.vrfy and SMTP.expn send the caller-supplied email address to the server without rejecting embedded CR/LF \r\n bytes. An address that contains a CR/LF is written verbatim onto the SMTP control connection, so the bytes after the CRLF are framed by the...

GHSA-V3Q9-HJ7J-63HQ aiosmtplib vulnerable to SMTP command injection via CR/LF in sender/recipient address

Summary aiosmtplib's SMTP.mail, SMTP.rcpt, SMTP.vrfy and SMTP.expn send the caller-supplied email address to the server without rejecting embedded CR/LF \r\n bytes. An address that contains a CR/LF is written verbatim onto the SMTP control connection, so the bytes after the CRLF are framed by the...

aiosmtplib vulnerable to SMTP command injection via CR/LF in sender/recipient address

Summary aiosmtplib's SMTP.mail, SMTP.rcpt, SMTP.vrfy and SMTP.expn send the caller-supplied email address to the server without rejecting embedded CR/LF \r\n bytes. An address that contains a CR/LF is written verbatim onto the SMTP control connection, so the bytes after the CRLF are framed by the...

CRLF Injection

Overview aiosmtplib is an aiosmtplib is an asynchronous SMTP client for use with asyncio. Affected versions of this package are vulnerable to CRLF Injection via the SMTPProtocol.executecommand path in src/aiosmtplib/protocol.py. An attacker can inject extra SMTP verbs by supplying a sender or...

python311-aiosmtplib-5.1.1-1.1 on GA media (moderate)

python311-aiosmtplib-5.1.1-1.1 on GA media Announcement ID: openSUSE-SU-2026:11035-1 Rating: moderate Cross-References: CVE-2026-53533 CVSS scores: CVE-2026-53533 SUSE : 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N CVE-2026-53533 SUSE : 6.9...

OPENSUSE-SU-2026:11035-1 python311-aiosmtplib-5.1.1-1.1 on GA media

These are all security issues fixed in the python311-aiosmtplib-5.1.1-1.1 package on the GA media of openSUSE Tumbleweed...

PT-2026-49732

Name of the Vulnerable Software and Affected Versions aiosmtplib versions prior to 5.1.1 Description The software fails to reject embedded carriage return and line feed CRLF bytes in email addresses. When a caller-supplied address containing these bytes is passed to the SMTP.mail, SMTP.rcpt,...

SMTP Injection

Overview aiosmtplib is an aiosmtplib is an asynchronous SMTP client for use with asyncio. Affected versions of this package are vulnerable to SMTP Injection. It is possible to insert an arbitrary SMTP command through the hostname or the sourceaddress field. PoC python import asyncio from...