What is CVE-2026-121425?

CVE-2026-121425 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-2026-121425?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Improper input validation in Nodemailer

CVE-2026-121425

Nodemailer from 3.0.0 before 10.1.4 contains a parsing flaw in addressparser that ends an RFC 5322 group at a semicolon inside quoted display names or comments. Attackers can submit crafted group addresses that conformant validators approve, redirecting mail to attacker-chosen recipients and bypassing recipient allow lists.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2026-11-03 · last modified 2026-11-03.

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

Nodemailer

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

github.com/nodemailer/nodemailer/security/advisories/GHSA-m943-m63m-w62w (vendor-advisory)
www.vulncheck.com/advisories/nodemailer-3.0.0-before-10.1.4-recipient-injection… (third-party-advisory)

Frequently asked questions

What is CVE-2026-121425?: CVE-2026-121425 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-2026-121425?: Medium severity. CVSS v3 base score is 6.5 out of 10.