CVE-2026-92596

High

Description

Nodemailer before 9.1.0 contains a quadratic time complexity vulnerability in the addressparser component that allows remote attackers to cause denial of service by supplying a crafted comma-separated address list. Attackers can send a single email with a large number of addresses to block the Node.js event loop for extended periods, consuming 100% CPU and freezing the process.

SeverityHigh

CVSS7.5

Exploit probability—

ProductNodemailer

PublishedSep 16, 2026

First seenSep 16, 2026

Weakness typeCWE-400Uncontrolled resource consumption

How to fix

Update

nodemailer9.1.0 or later

Patches

Vendor advisories

github.com/nodemailer/nodemailer/security/advisories/GHSA-2x7j-588g-ccc2

Affected products

Product	Affected versions	Fixed in
nodemailernpm	v < 9.1.0	9.1.0

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