Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck
CVE-2026-121424Nodemailer 3.0.0 before 10.1.4 Address Parsing Bypass via Nested Comments
Medium 6.5
In plain English
A medium-severity improper input validation in nodemailer from nodemailer. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% 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 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | node-nodemailer | no fix listed | DEBIAN-CVE-2026-121424 |
| Debian:13 | node-nodemailer | no fix listed | DEBIAN-CVE-2026-121424 |
| Debian:14 | node-nodemailer | no fix listed | DEBIAN-CVE-2026-121424 |
| Ubuntu:22.04:LTS | node-nodemailer | no fix listed | UBUNTU-CVE-2026-121424 |
| Ubuntu:24.04:LTS | node-nodemailer | no fix listed | UBUNTU-CVE-2026-121424 |
| Ubuntu:26.04:LTS | node-nodemailer | no fix listed | UBUNTU-CVE-2026-121424 |
| Ubuntu:26.10 | node-nodemailer | no fix listed | UBUNTU-CVE-2026-121424 |
| npm | nodemailer | 10.1.4 | GHSA-8c8m-p3m8-cjg8 |
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-8c8m-p3m8-cjg8) vendor-advisory
- VulnCheck Advisory: Nodemailer 3.0.0 before 10.1.4 Address Parsing Bypass via Nested Comments third-party-advisory