CVE-2026-92598: Nodemailer

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Nodemailer before 9.1.0 fails to apply UTS-46 normalization when encoding international domain names, causing the domain resolver to compute a different Punycode A-label than standards-compliant parsers. Attackers can craft recipient addresses with invisible characters or compatibility mappings that pass domain allow-list checks but are delivered to attacker-controlled domains via SMTP.

Affected products

• Nodemailer Nodemailer: before 9.1.0 (fixed in 9.1.0)

Published 2026-09-16. Last modified 2026-09-22.