What’s Vulnerable › Vulnerabilities

CVE-2026-110870: Nodemailer before 10.0.13 Improper Input Validation via Angle-Bracket Address Comments

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-26
• Weakness: CWE-20

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.

Affected products

• Npm Nodemailer: from 3.0.0 before 10.0.13 — fixed in 10.0.13
• nodemailer: from 3.0.0 before 10.0.13 — fixed in 10.0.13

How to fix

Upgrade to a fixed version: Npm Nodemailer 10.0.13; nodemailer 10.0.13. Check the vendor advisory for mitigations.

References

• https://github.com/nodemailer/nodemailer/security/advisories/GHSA-g73g-hqqh-jr95
• https://www.vulncheck.com/advisories/nodemailer-before-10.0.13-improper-input-validation-via-angle-bracket-address-comments
• https://github.com/nodemailer/nodemailer/security/advisories/GHSA-g73g-hqqh-jr95

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