CVE-2026-92596

Summary

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.

Affected Software

Weaknesses

• CWE-400: Uncontrolled Resource Consumption

References

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

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