CVE-2026-100700

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductNodemailer

PublishedSep 26, 2026

First seenSep 26, 2026

Weakness typeCWE-407CWE-407

How to fix

Update

nodemailer10.0.6 or later

Vendor advisories

github.com/nodemailer/nodemailer/security/advisories/GHSA-v53p-9fqp-m79j

Affected products

Product	Affected versions	Fixed in
nodemailernpm	v < 10.0.6	10.0.6

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