Vulnerability in Nodemailer
CVE-2026-100702
Nodemailer before 10.0.2 fails to properly flatten deeply nested arrays in recipient fields such as to, cc, and bcc, allowing attackers to cause stack exhaustion. Attackers can supply a deeply nested JSON recipient array that triggers recursive Array.toString() conversion, exhausting the call stack and terminating the Node.js process.
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-8vvx-rff5-p5rq (vendor-advisory)
- www.vulncheck.com/advisories/nodemailer-before-10.0.2-stack-exhaustion-via-nest… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100702?
- CVE-2026-100702 is a medium-severity vulnerability in Nodemailer, classified under Uncontrolled Recursion. CVSS score: 5.9/10. Published 2026-09-26.
- How severe is CVE-2026-100702?
- Medium severity. CVSS v3 base score is 5.9 out of 10.