CVE-2026-110870

Medium

Description

Nodemailer from 3.0.0 before 10.0.13 contains an improper input validation vulnerability in its address parser that fails to strip RFC 5322 comments inside angle-bracket addresses. Attackers can supply recipients like a display name with a parenthesized comment in the domain, so illegal characters reach envelope.to and RCPT TO, causing rejected delivery or parser interpretation conflicts that bypass domain allow-lists.

SeverityMedium

CVSS5.3

Exploit probability—

ProductNodemailer

PublishedOct 14, 2026

First seenOct 14, 2026

Weakness typeCWE-20Improper input validation

How to fix

Update

nodemailer10.0.13 or later

Vendor advisories

github.com/nodemailer/nodemailer/security/advisories/GHSA-g73g-hqqh-jr95

Affected products

Product	Affected versions	Fixed in
nodemailernpm	3.0.0 ≤ v < 10.0.13	10.0.13

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