What is CVE-2026-92596?

CVE-2026-92596 is a high-severity vulnerability in Nodemailer, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-09-16.

How severe is CVE-2026-92596?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Nodemailer

CVE-2026-92596

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.

Vulnerability class: DoS (Denial of Service)

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Nodemailer

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-92596?: CVE-2026-92596 is a high-severity vulnerability in Nodemailer, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-09-16.
How severe is CVE-2026-92596?: High severity. CVSS v3 base score is 7.5 out of 10.