Resource exhaustion in Nodemailer
CVE-2026-92596
Nodemailer before 9.1.0 contains a quadratic time complexity vulnerability in the addressparser component that allows remote attackers to cause denial of service by supplying a crafted comma-separated address list. Attackers can send a single email with a large number of addresses to block the Node.js event loop for extended periods, consuming 100% CPU and freezing the process.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.008 (57.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/nodemailer/nodemailer/security/advisories/GHSA-2x7j-588g-ccc2 (vendor-advisory)
- github.com/nodemailer/nodemailer/commit/9116da9 (patch)
- github.com/nodemailer/nodemailer/commit/7cc38af (patch)
- github.com/nodemailer/nodemailer/commit/34da642 (patch)
- github.com/nodemailer/nodemailer/commit/83b8c48 (patch)
- www.vulncheck.com/advisories/nodemailer-before-9.1.0-denial-of-service-via-addr… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-92596?
- CVE-2026-92596 is a high-severity vulnerability in Nodemailer, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-09-16.
- How severe is CVE-2026-92596?
- High severity. CVSS v3 base score is 7.5 out of 10.