#VU125299 CRLF injection in nodemailer

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Main Vulnerability Database Vulnerabilities #VU125299

#VU125299 CRLF injection in nodemailer

Published: April 8, 2026


Vulnerability identifier: #VU125299
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-93
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
nodemailer
Software vendor:
nodemailer

Description

The vulnerability allows a remote user to inject arbitrary SMTP commands.

The vulnerability exists due to improper neutralization of CRLF sequences in lib/smtp-connection/index.js when processing a custom envelope.size value in sendMail(). A remote user can supply a crafted envelope.size value containing CRLF characters to inject arbitrary SMTP commands.

This issue can silently add attacker-controlled recipients to outgoing emails. Exploitation requires the application to explicitly pass a custom envelope object with a size property to sendMail().


Remediation

Install security update from vendor's website.

External links