CVE-2026-110871

CVSS 7.1 (high) · published 2026-10-14

Nodemailer from 3.0.0 before 10.0.10 contains a denial of service vulnerability in MessageParser.parseHeaders that allows users to exhaust CPU through quadratic header unfolding. Attackers can supply large recipient lists or long headers that fold into tens of thousands of continuation lines, blocking the Node.js event loop during DKIM signing.

Weakness: CWE-400

Source: NVD CVE-2026-110871

References

• https://github.com/nodemailer/nodemailer/security/advisories/GHSA-39m8-27wv-hr27
• https://www.vulncheck.com/advisories/nodemailer-3.0.0-before-10.0.10-quadratic-dkim-header-unfolding-denial-of-service
• https://github.com/nodemailer/nodemailer/security/advisories/GHSA-39m8-27wv-hr27

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