CVE-2026-90776 [HIGH] – Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability

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.