CVE-2026-100700

Description

nodemailer before 10.0.6 contains a denial of service vulnerability in the addressparser free-text fallback regex pattern that exhibits quadratic backtracking behavior. Attackers can supply crafted email header values with long whitespace-free runs to block the Node.js event loop for tens of seconds, causing service unavailability.

CVSS Vector

References

• https://github.com/nodemailer/nodemailer/security/advisories/GHSA-v53p-9fqp-m79j
• https://www.vulncheck.com/advisories/nodemailer-before-10.0.6-denial-of-service-via-addressparser