Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck
CVE-2026-121426Nodemailer 3.0.0 before 10.1.4 Recipient Domain Confusion via addressparser
Medium 6.5
In plain English
A medium-severity improper input validation in nodemailer from nodemailer. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | node-nodemailer | no fix listed | DEBIAN-CVE-2026-121426 |
| Debian:13 | node-nodemailer | no fix listed | DEBIAN-CVE-2026-121426 |
| Debian:14 | node-nodemailer | no fix listed | DEBIAN-CVE-2026-121426 |
| Ubuntu:22.04:LTS | node-nodemailer | no fix listed | UBUNTU-CVE-2026-121426 |
| Ubuntu:24.04:LTS | node-nodemailer | no fix listed | UBUNTU-CVE-2026-121426 |
| Ubuntu:26.04:LTS | node-nodemailer | no fix listed | UBUNTU-CVE-2026-121426 |
| Ubuntu:26.10 | node-nodemailer | no fix listed | UBUNTU-CVE-2026-121426 |
| npm | nodemailer | 10.1.4 | GHSA-85x2-q946-cp5h |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nodemailer | nodemailer | 3.0.0 – before 10.1.4 |
Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
References
- GitHub Security Advisory (GHSA-85x2-q946-cp5h) vendor-advisory
- VulnCheck Advisory: Nodemailer 3.0.0 before 10.1.4 Recipient Domain Confusion via addressparser third-party-advisory