Vulnerability Description
Nodemailer before 9.1.0 fails to apply UTS-46 normalization when encoding international domain names, causing the domain resolver to compute a different Punycode A-label than standards-compliant parsers. Attackers can craft recipient addresses with invisible characters or compatibility mappings that pass domain allow-list checks but are delivered to attacker-controlled domains via SMTP.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/nodemailer/nodemailer/commit/259c32d
- https://github.com/nodemailer/nodemailer/commit/b212ac4
- https://github.com/nodemailer/nodemailer/security/advisories/GHSA-wmmp-3585-3rmp
- https://www.vulncheck.com/advisories/nodemailer-before-9.1.0-idn-punycode-domain
- https://github.com/nodemailer/nodemailer/security/advisories/GHSA-wmmp-3585-3rmp
FAQ
What is CVE-2026-92598?
CVE-2026-92598 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Nodemailer before 9.1.0 fails to apply UTS-46 normalization when encoding international domain names, causing the domain resolver to compute a different Punycode A-label than standards-compliant parse...
How severe is CVE-2026-92598?
CVE-2026-92598 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-92598?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.