CVE-2026-90776

High

Description

Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email addresses with RFC 5322 comments. Attackers can craft malicious email headers with comment-separated atoms to consume excessive CPU and block the Node.js event loop for several seconds, causing denial of service.

SeverityHigh

CVSS7.5

Exploit probability—

ProductNodemailer

PublishedSep 13, 2026

First seenSep 13, 2026

Weakness typeCWE-407CWE-407

How to fix

Update

nodemailer10.0.5 or later

Patches

github.com/nodemailer/nodemailer/commit/c07f17518d25aca8ab2ad66968dcbca538c24b89

Vendor advisories

Affected products

Product	Affected versions	Fixed in
nodemailernpm	9.1.0 ≤ v < 10.0.5	10.0.5

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