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
EPSS: 0.003 (16.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-8vvx-rff5-p5rq) (vendor-advisory)
- VulnCheck Advisory: Nodemailer before 10.0.2 Stack Exhaustion via Nested Recipient Arrays (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.