Input validation error in nodemailer - CVE-2026-100699
Published: September 30, 2026
Vulnerability identifier: #VU153018
CSH Severity: Medium
CVSS v4: 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]
CVE-ID: CVE-2026-100699
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
nodemailer
How to mitigate CVE-2026-100699
Install security update from vendor's website.
nodemailer - update to 10.0.9