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.
Published: 2026-09-16
Score: 8.3 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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Advisories

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History

Wed, 16 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
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.
Title Nodemailer before 9.1.0 IDN/Punycode Domain Allow-list Bypass
First Time appeared Nodemailer
Nodemailer nodemailer
Weaknesses CWE-436
CPEs cpe:2.3:a:nodemailer:nodemailer:*:*:*:*:*:*:*:*
Vendors & Products Nodemailer
Nodemailer nodemailer
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N'}

cvssV4_0

{'score': 8.3, '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'}

Subscriptions

Nodemailer Nodemailer
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-16T21:47:02.365Z

Reserved: 2026-09-16T13:48:49.970Z

Link: CVE-2026-92598

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-16T22:18:30.840

Modified: 2026-09-16T22:18:30.840

Link: CVE-2026-92598

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses