CVE-2026-121426

Medium

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.

SeverityMedium

CVSS6.5

Exploit probability—

ProductNodemailer

PublishedNov 3, 2026

First seenNov 4, 2026

Weakness typeCWE-20Improper input validation

How to fix

Update

nodemailer nodemailer10.1.4 or later

Vendor advisories

github.com/nodemailer/nodemailer/security/advisories/GHSA-85x2-q946-cp5h

Affected products

Product	Affected versions	Fixed in
nodemailer nodemailer	3.0.0 ≤ v < 10.1.4	10.1.4

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