Address Parsing Flaw in Nodemailer Affects Email Delivery
CVE-2026-121425

8.3HIGH

Key Information:

Vendor

Nodemailer

Status
Nodemailer
Vendor
CVE Published:
3 November 2026

What is CVE-2026-121425?

Nodemailer prior to version 10.1.4 contains a critical address parsing flaw in the addressparser function. This issue allows attackers to craft group addresses that, while appearing valid to standard validators, can mislead email delivery systems. As a result, attackers can redirect emails to specified recipients of their choice, effectively bypassing any established recipient allow lists. This flaw poses significant risks for organizations relying on Nodemailer for secure email communications, making it essential to upgrade to the latest version to mitigate potential exploitation.

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

.