Vulnerability Description
Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email addresses with RFC 5322 comments. Attackers can craft malicious email headers with comment-separated atoms to consume excessive CPU and block the Node.js event loop for several seconds, causing denial of service.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/nodemailer/nodemailer
- https://github.com/nodemailer/nodemailer/blob/v10.0.4/src/addressparser/index.ts
- https://github.com/nodemailer/nodemailer/commit/c07f17518d25aca8ab2ad66968dcbca5
- https://github.com/nodemailer/nodemailer/releases/tag/v10.0.5
- https://github.com/nodemailer/nodemailer/security/advisories/GHSA-prgh-xp8r-p3m5
- https://www.vulncheck.com/advisories/nodemailer-9.1.0-through-10.0.4-denial-of-s
- https://github.com/nodemailer/nodemailer/security/advisories/GHSA-prgh-xp8r-p3m5
FAQ
What is CVE-2026-90776?
CVE-2026-90776 is a vulnerability with a CVSS score of 7.5 (HIGH). Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email addresses with RFC 5322 comments. Attackers can craft malic...
How severe is CVE-2026-90776?
CVE-2026-90776 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-90776?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.