CVE-2026-121424

Medium

Description

Nodemailer from 3.0.0 before 10.1.4 contains an address parsing vulnerability in addressparser that allows remote attackers to redirect recipients by ending nested RFC 5322 comments at the first closing parenthesis. Attackers can submit addresses whose nested comment hides an attacker address, bypassing conformant validators and recipient allow lists to receive mail or spoof senders in mailparser.

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-8c8m-p3m8-cjg8

Affected products

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

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