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.
Published: 2026-09-13
Score: 8.7 High
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Wed, 16 Sep 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 14 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1333
References
Metrics threat_severity

None

threat_severity

Important


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'}


Subscriptions

Nodemailer Nodemailer
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-16T14:04:56.860Z

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

Link: CVE-2026-90776

cve-icon Vulnrichment

Updated: 2026-09-16T14:04:45.962Z

cve-icon NVD

Status : Received

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

Modified: 2026-09-16T15:18:42.833

Link: CVE-2026-90776

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-13T11:42:26Z

Links: CVE-2026-90776 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-15T18:00:17Z

Weaknesses