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.

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History

Sun, 13 Sep 2026 11:45:00 +0000

Type Values Removed Values Added
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.
Title Nodemailer 9.1.0 through 10.0.4 Denial of Service via Quadratic Address Parsing
First Time appeared Nodemailer
Nodemailer nodemailer
Weaknesses CWE-407
CPEs cpe:2.3:a:nodemailer:nodemailer:*:*:*:*:*:*:*:*
Vendors & Products Nodemailer
Nodemailer nodemailer
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': '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'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-13T11:42:26.391Z

Reserved: 2026-09-13T11:15:41.904Z

Link: CVE-2026-90776

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-13T12:17:16.547

Modified: 2026-09-13T12:17:16.547

Link: CVE-2026-90776

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-13T13:30:03Z

Weaknesses