CVE-2026-92598
Nodemailer before 9.1.0 IDN/Punycode Domain Allow-list Bypass
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-436 |
| Vendor | nodemailer |
| Product | nodemailer |
| Published | Sep 16, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None
Affected Versions
nodemailer / nodemailer
0 < 9.1.0
References
github.com: https://github.com/nodemailer/nodemailer/security/advisories/GHSA-wmmp-3585-3rmp github.com: https://github.com/nodemailer/nodemailer/commit/259c32d github.com: https://github.com/nodemailer/nodemailer/commit/b212ac4 vulncheck.com: https://www.vulncheck.com/advisories/nodemailer-before-9.1.0-idn-punycode-domain-allow-list-bypass
Credits
🔍 e1abrador