Nodemailer before 9.1.0 contains a quadratic time complexity vulnerability in the addressparser component that allows remote attackers to cause denial of service by supplying a crafted comma-separated address list. Attackers can send a single email with a large number of addresses to block the Node.js event loop for extended periods, consuming 100% CPU and freezing the process.
Advisories

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Fixes

Solution

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Workaround

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History

Wed, 16 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
Description Nodemailer before 9.1.0 contains a quadratic time complexity vulnerability in the addressparser component that allows remote attackers to cause denial of service by supplying a crafted comma-separated address list. Attackers can send a single email with a large number of addresses to block the Node.js event loop for extended periods, consuming 100% CPU and freezing the process.
Title Nodemailer before 9.1.0 Denial of Service via addressparser
First Time appeared Nodemailer
Nodemailer nodemailer
Weaknesses CWE-400
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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-16T21:47:00.900Z

Reserved: 2026-09-16T13:48:49.970Z

Link: CVE-2026-92596

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-16T22:18:30.557

Modified: 2026-09-16T22:18:30.557

Link: CVE-2026-92596

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses