Nodemailer before 9.1.0 Denial of Service via addressparser

Advisories

Nodemailer before 9.1.0 Denial of Service via addressparser

severity: high
date: 9/16/2026
Affecting: nodemailer >= 0, < 9.1.0
CVE: CVE-2026-92596
CWE: CWE-400 Uncontrolled Resource Consumption
CVSS: 8.7
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References: GitHub Security Advisory (GHSA-2x7j-588g-ccc2)
Patch Commit
Patch Commit
Patch Commit
Patch Commit
Credit: e1abrador
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.

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