nodemailer before 10.0.6 contains a denial of service vulnerability in the addressparser free-text fallback regex pattern that exhibits quadratic backtracking behavior. Attackers can supply crafted email header values with long whitespace-free runs to block the Node.js event loop for tens of seconds, causing service unavailability.

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Fixes

Solution

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Workaround

No workaround given by the vendor.

History

Mon, 28 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Sun, 27 Sep 2026 00:15:00 +0000

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

None

threat_severity

Important


Sat, 26 Sep 2026 13:30:00 +0000

Type Values Removed Values Added
Description nodemailer before 10.0.6 contains a denial of service vulnerability in the addressparser free-text fallback regex pattern that exhibits quadratic backtracking behavior. Attackers can supply crafted email header values with long whitespace-free runs to block the Node.js event loop for tens of seconds, causing service unavailability.
Title nodemailer before 10.0.6 Denial of Service via addressparser
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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-28T15:01:54.036Z

Reserved: 2026-09-26T02:39:50.973Z

Link: CVE-2026-100700

cve-icon Vulnrichment

Updated: 2026-09-28T15:00:40.371Z

cve-icon NVD

Status : Received

Published: 2026-09-26T14:16:55.007

Modified: 2026-09-28T16:17:10.847

Link: CVE-2026-100700

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-26T13:23:56Z

Links: CVE-2026-100700 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-27T02:00:18Z

Weaknesses