CVE-2026-121426
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Nodemailer Address Parsing Bypass via Angle-Addr

Publication date: 2026-11-03

Last updated on: 2026-11-03

Assigner: VulnCheck

Description
Nodemailer from 3.0.0 before 10.1.4 contains an address parsing vulnerability in addressparser that ends an angle-addr at a '>' inside a quoted local part, comment or domain literal. Attackers can submit addresses that validate as an allowed domain but are delivered to an attacker-controlled domain, bypassing recipient allow lists and disclosing message content.

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Meta Information

Published
2026-11-03
Last Modified
2026-11-03
Generated
2026-11-03
AI Q&A
2026-11-03
EPSS Evaluated
N/A
NVD
CVE-2026-121426
EUVD
EUVD-2026-115958

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
nodemailer nodemailer 3.0.0

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

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Executive Summary

This vulnerability affects Nodemailer versions 3.0.0 through 10.1.3. It involves a flaw in the addressparser component where email addresses containing a '>' character inside quoted local parts, comments, or domain literals are incorrectly parsed. Attackers can craft addresses that appear valid but deliver messages to attacker-controlled domains, bypassing recipient allow lists.

Detection Guidance

Check Nodemailer version with: npm list nodemailer. If version is between 3.0.0 and 10.1.3, the system is vulnerable. Review email logs for unexpected RCPT TO commands with domains containing '>' characters.

Impact Analysis

If exploited, this vulnerability could allow unauthorized disclosure of email content by redirecting messages to attacker-controlled domains. Systems using Nodemailer to validate recipient domains may be tricked into sending emails outside intended domains, compromising data confidentiality.

Compliance Impact

This vulnerability could lead to unauthorized data disclosure, violating GDPR's data protection principles and HIPAA's confidentiality requirements. Organizations may face compliance breaches if sensitive email content is exposed due to the flaw.

Mitigation Strategies

Upgrade Nodemailer to version 10.1.4 or later immediately. If upgrading is not possible, implement strict input validation for email addresses to reject any containing '>' characters.

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