SB20260930104 - Input validation error in nodemailer

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Main Vulnerability Database SB20260930104

SB20260930104 - Input validation error in nodemailer

Published: September 30, 2026 Updated: September 30, 2026

Security Bulletin ID SB20260930104
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Input validation error (CVE-ID: CVE-2026-100699)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to alter the integrity of email recipient addressing.

The vulnerability exists due to improper input validation in the Nodemailer address parser when parsing an address with a quoted local-part followed by an RFC 5322 comment and trailing domain text. A remote attacker can supply a crafted recipient address to alter the integrity of email recipient addressing.

The parsed address is propagated into the SMTP envelope without an additional strict recipient-address validation step.


Remediation

Install update from vendor's website.

References