CVE-2026-92596: DoS (CVSS 7.5)

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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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

References

Other References

https://github.com/nodemailer/nodemailer/commit/34da642 https://github.com/nodemailer/nodemailer/commit/7cc38af https://github.com/nodemailer/nodemailer/commit/83b8c48 https://github.com/nodemailer/nodemailer/commit/9116da9 https://github.com/nodemailer/nodemailer/security/advisories/GHSA-2x7j-588g-ccc2 https://www.vulncheck.com/advisories/nodemailer-before-9.1.0-denial-of-service-via-addressparser

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-92596? +

CVE-2026-92596 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2026-92596? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-92596