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.
History

Fri, 18 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-289
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 17 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

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

Updated: 2026-09-17T14:43:20.281Z

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

Link: CVE-2026-92598

cve-icon Vulnrichment

Updated: 2026-09-17T14:40:27.336Z

cve-icon NVD

Status : Awaiting Analysis

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

Modified: 2026-09-22T20:25:55.870

Link: CVE-2026-92598

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-16T21:47:02Z

Links: CVE-2026-92598 - Bugzilla