High severity7.5NVD Advisory· Published Sep 26, 2026

CVE-2026-100700

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.

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Affected products

Nodemailer/Nodemailerllm-fuzzy
Range: <10.0.6

Patches

Vulnerability mechanics

References

github.com/nodemailer/nodemailer/security/advisories/GHSA-v53p-9fqp-m79jnvd
www.vulncheck.com/advisories/nodemailer-before-10.0.6-denial-of-service-via-addressparsernvd

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cvss	0.488
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000