Address Parsing Vulnerability in Nodemailer by Nodemailer
CVE-2026-121424

8.3HIGH

Key Information:

Vendor

Nodemailer

Status
Nodemailer
Vendor
CVE Published:
3 November 2026

What is CVE-2026-121424?

Nodemailer versions 3.0.0 through 10.1.4 are susceptible to an address parsing vulnerability due to improper handling of nested comments in email addresses, allowing attackers to manipulate recipient addresses. By crafting a malicious email address with nested RFC 5322 comments, an attacker can conceal their identity, bypassing standard validation checks and recipient allow lists. This vulnerability can lead to unauthorized mail delivery and the potential for email spoofing attacks.

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

.