CVE-2026-90776: Nodemailer

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Nodemailer Nodemailer: from 9.1.0, before 10.0.5 (fixed in 10.0.5)

Published 2026-09-13. Last modified 2026-09-24.