CVE-2026-92598

EUVD-2026-81298
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
6.5 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 33.75%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
nodemailernodemailer
𝑥
< 9.1.0
CNA
Debian logo
Debian Releases
Debian Product
Codename
node-nodemailer
bookworm
postponed
forky
10.0.14+~8.0.2-1
fixed
sid
10.1.7+~8.0.2-1
fixed
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
node-nodemailer
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
stonking
needs-triage
Common Weakness Enumeration
References
https://github.com/nodemailer/nodemailer/commit/259c32d
https://github.com/nodemailer/nodemailer/commit/b212ac4
https://github.com/nodemailer/nodemailer/security/advisories/GHSA-wmmp-3585-3rmp
https://www.vulncheck.com/advisories/nodemailer-before-9.1.0-idn-punycode-domain-allow-list-bypass
https://github.com/nodemailer/nodemailer/security/advisories/GHSA-wmmp-3585-3rmp