Medium 6.5Published Sep 16, 2026

CVE-2026-92598Nodemailer before 9.1.0 IDN/Punycode Domain Allow-list Bypass

Updated under an hour ago (2026-10-19 09:40 UTC)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for nodemailer

Exploited in the last 30 days

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: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness (CWE): CWE-436
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Awaiting Analysis
Record last updated: Sep 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

nodemailer nodemailer nodemailer:nodemailer (from the name)	before 9.1.0; 9.1.0 not affected	CNA record

References

https://github.com/nodemailer/nodemailer/security/advisories/GHSA-wmmp-3585-3rmpvendor-advisory
https://github.com/nodemailer/nodemailer/commit/259c32dpatch
https://github.com/nodemailer/nodemailer/commit/b212ac4patch
https://www.vulncheck.com/advisories/nodemailer-before-9.1.0-idn-punycode-domain-allow-list-bypassthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.