Resource exhaustion in Nodemailer
CVE-2026-110872
Nodemailer from 3.0.0 before 10.0.10 contains a quadratic complexity denial of service vulnerability in the SMTP client reply parser in SMTPConnection._onData and isPartialResponse. A malicious SMTP server or on-path attacker can stream continuation lines without a completion line before authentication, blocking the Node.js event loop and exhausting memory.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/nodemailer/nodemailer/security/advisories/GHSA-4g23-2xm8-66gc (vendor-advisory)
- www.vulncheck.com/advisories/nodemailer-3.0.0-before-10.0.10-denial-of-service-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110872?
- CVE-2026-110872 is a medium-severity vulnerability in Nodemailer, classified under Uncontrolled Resource Consumption. CVSS score: 5.9/10. Published 2026-10-14.
- How severe is CVE-2026-110872?
- Medium severity. CVSS v3 base score is 5.9 out of 10.