Address Parsing Vulnerability in Nodemailer by Node.js
CVE-2026-121426

8.3HIGH

Key Information:

Vendor

Nodemailer

Status
Nodemailer
Vendor
CVE Published:
3 November 2026

What is CVE-2026-121426?

The Nodemailer library, specifically versions from 3.0.0 to 10.1.3, has a flaw in its address parsing mechanism. This vulnerability can be exploited when an attacker crafts email addresses that appear valid under certain conditions but are ultimately routed to a malicious domain. By bypassing recipient allow lists, such attacks can lead to unauthorized access to message content, raising significant email security concerns for users relying on Nodemailer for email delivery.

Affected Version(s)

nodemailer 3.0.0 < 10.1.4

nodemailer 10.1.4

References

https://github.com/nodemailer/nodemailer/security/advisor...
vendor-advisory
https://www.vulncheck.com/advisories/nodemailer-3.0.0-bef...
third-party-advisory

CVSS V4

Score:
8.3
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.