CVE-2026-100702: Nodemailer

Medium severity, CVSS 5.9. EPSS: 0.3% chance of exploitation in the next 30 days.

Nodemailer before 10.0.2 fails to properly flatten deeply nested arrays in recipient fields such as to, cc, and bcc, allowing attackers to cause stack exhaustion. Attackers can supply a deeply nested JSON recipient array that triggers recursive Array.toString() conversion, exhausting the call stack and terminating the Node.js process.

Affected products

• Nodemailer Nodemailer: before 10.0.2 (fixed in 10.0.2)

Published 2026-09-26. Last modified 2026-09-30.