CVE-2026-121424

EUVD-2026-115956
Nodemailer from 3.0.0 before 10.1.4 contains an address parsing vulnerability in addressparser that allows remote attackers to redirect recipients by ending nested RFC 5322 comments at the first closing parenthesis. Attackers can submit addresses whose nested comment hides an attacker address, bypassing conformant validators and recipient allow lists to receive mail or spoof senders in mailparser.
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: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
nodemailernodemailer
3.0.0 ≤
𝑥
< 10.1.4
CNA
Common Weakness Enumeration
References
https://github.com/nodemailer/nodemailer/security/advisories/GHSA-8c8m-p3m8-cjg8
https://www.vulncheck.com/advisories/nodemailer-3.0.0-before-10.1.4-address-parsing-bypass-via-nested-comments