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Advisories

Nodemailer before 9.1.0 IDN/Punycode Domain Allow-list Bypass

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severity
high
date
Affecting

  • nodemailer >= 0, < 9.1.0

CWE
  • CWE-436 Interpretation Conflict
CVSS
8.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Credit
e1abrador
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.

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