Improper input validation in Nodemailer
CVE-2026-121426
Nodemailer from 3.0.0 before 10.1.4 contains an address parsing vulnerability in addressparser that ends an angle-addr at a '>' inside a quoted local part, comment or domain literal. Attackers can submit addresses that validate as an allowed domain but are delivered to an attacker-controlled domain, bypassing recipient allow lists and disclosing message content.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/nodemailer/nodemailer/security/advisories/GHSA-85x2-q946-cp5h (vendor-advisory)
- www.vulncheck.com/advisories/nodemailer-3.0.0-before-10.1.4-recipient-domain-co… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-121426?
- CVE-2026-121426 is a medium-severity vulnerability in Nodemailer, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-11-03.
- How severe is CVE-2026-121426?
- Medium severity. CVSS v3 base score is 6.5 out of 10.