CVE-2026-53533— aiosmtplib: SMTP command injection via CR/LF in sender/recipient address
Possible ATT&CK Techniques 1AI
T1071.008Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| cole | aiosmtplib | < 5.1.1 | affected |
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I. Basic Information for CVE-2026-53533
Vulnerability Information
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Vulnerability Title
aiosmtplib: SMTP command injection via CR/LF in sender/recipient address
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| cole | aiosmtplib | < 5.1.1 | - |
II. Public POCs for CVE-2026-53533
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-53533 (1)
Vendor Advisories for CVE-2026-53533 (1)
Vendor Pages for CVE-2026-53533 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2026-53533
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