Improper Input Validation in Nodemailer Affects Email Delivery Functionality
CVE-2026-110870

6.9MEDIUM

Key Information:

Vendor

Nodemailer

Status
Nodemailer
Vendor
CVE Published:
14 October 2026

What is CVE-2026-110870?

An improper input validation vulnerability exists in Nodemailer prior to version 10.0.13. This flaw in the address parser fails to adequately handle RFC 5322 comments, allowing attackers to exploit displays containing parenthesized comments within angle-bracketed addresses. Consequently, illegal characters can infiltrate the envelope.to and RCPT TO fields, resulting in the potential for email delivery failures or parser conflicts that might bypass existing domain allow-lists.

Affected Version(s)

nodemailer 3.0.0 < 10.0.13

nodemailer 10.0.13

References

https://github.com/nodemailer/nodemailer/security/advisor...
vendor-advisory
https://www.vulncheck.com/advisories/nodemailer-before-10...
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

StarPlatinu
.