CVE-2026-100700

EUVD-2026-87673
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
nodemailernodemailer
𝑥
< 10.0.6
CNA
Debian logo
Debian Releases
Debian Product
Codename
node-nodemailer
bookworm
vulnerable
forky
10.0.10+~8.0.1-1
fixed
sid
10.0.10+~8.0.1-1
fixed
trixie
vulnerable
Common Weakness Enumeration
References
https://github.com/nodemailer/nodemailer/security/advisories/GHSA-v53p-9fqp-m79j
https://www.vulncheck.com/advisories/nodemailer-before-10.0.6-denial-of-service-via-addressparser