CVE-2026-100700CWE-407

CVE-2026-100700

High · published September 26, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
19.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
8.7 · 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
EPSS
0.00279 · 19.3th percentile
Weakness
CWE-407 · Inefficient Algorithmic Complexity
Published
2026-09-26T18:16Z
References (3)
https://github.com/nodemailer/nodemailer/security/advisories/GHSA-v53p-9fqp-m79j · [email protected]https://www.vulncheck.com/advisories/nodemailer-before-10.0.6-denial-of-service-via-addressparser · [email protected]https://github.com/nodemailer/nodemailer/security/advisories/GHSA-v53p-9fqp-m79j · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 28 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 26 SEP 13:23Z
    nodemailer before 10.0.6 Denial of Service via addressparser
    cvelistv5