CVE-2026-110870

Nodemailer before 10.0.13 Improper Input Validation via Angle-Bracket Address Comments

State: Published
Severity: 6.9 Medium
Published: Oct 14, 2026
Updated: Oct 26, 2026
Reserved: Oct 14, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	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	VulnCheck
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N	VulnCheck

Weaknesses

CWE-20 Improper Input Validation

Affected Products

Product	Versions
nodemailernodemailer	3.0.0 to before 10.0.13Affected 10.0.13Not affected

References

GitHub Security Advisory (GHSA-g73g-hqqh-jr95)vendor-advisory
VulnCheck Advisory: Nodemailer before 10.0.13 Improper Input Validation via Angle-Bracket Address Commentsthird-party-advisory

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