CVE-2026-121425

Medium

Description

Nodemailer from 3.0.0 before 10.1.4 contains a parsing flaw in addressparser that ends an RFC 5322 group at a semicolon inside quoted display names or comments. Attackers can submit crafted group addresses that conformant validators approve, redirecting mail to attacker-chosen recipients and bypassing recipient allow lists.

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-m943-m63m-w62w

Affected products

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

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