CVE-2026-90776

Nodemailer 9.1.0 through 10.0.4 Denial of Service via Quadratic Address Parsing

State: Published
Severity: 8.7 High
Published: Sep 13, 2026
Updated: Sep 24, 2026
Reserved: Sep 13, 2026

Description

Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email addresses with RFC 5322 comments. Attackers can craft malicious email headers with comment-separated atoms to consume excessive CPU and block the Node.js event loop for several seconds, causing denial of service.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	VulnCheck

Weaknesses

CWE-407 Inefficient Algorithmic Complexity

Affected Products

Product	Versions
nodemailernodemailer	9.1.0 to before 10.0.5Affected 10.0.5Not affected

References

GitHub Security Advisory (GHSA-prgh-xp8r-p3m5)vendor-advisory
Patch Commitpatch
Vulnerable join check in addressparser at v10.0.4technical-description
nodemailer v10.0.5 Release Notesrelease-notes
https://github.com/nodemailer/nodemailerproduct
VulnCheck Advisory: Nodemailer 9.1.0 through 10.0.4 Denial of Service via Quadratic Address Parsingthird-party-advisory

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