Vulnerability DatabaseCVE-2026-100700
Mend.io Vulnerability Database
The largest open source vulnerability database
What is a Vulnerability ID?
New vulnerability? Tell us about it!
CVE-2026-100700
Published:September 26, 2026
Updated:October 09, 2026
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.
Affected Packages
nodemailer (NPM):
Affected version(s) >=0.1.1 <10.0.6
Fix Suggestion:
Update to version 10.0.6
Related Resources (7)
https://github.com/nodemailer/nodemailer
https://github.com/nodemailer/nodemailer/security/advisories/GHSA-v53p-9fqp-m79j
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100700.json
https://nvd.nist.gov/vuln/detail/CVE-2026-100700
https://github.com/nodemailer/nodemailer/commit/437d7fc47403df176bc39271641541b7a9bce102
https://www.vulncheck.com/advisories/nodemailer-before-10.0.6-denial-of-service-via-addressparser
https://github.com/nodemailer/nodemailer/releases/tag/v10.0.6
Do you need more information?
Contact Us
CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Inefficient Algorithmic Complexity
CWE-407
Inefficient Regular Expression Complexity
CWE-1333
EPSS
Base Score:
0.28