What’s Vulnerable › Vulnerabilities

CVE-2026-100702: Nodemailer before 10.0.2 Stack Exhaustion via Nested Recipient Arrays

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-26 · updated 2026-09-30
• Weakness: CWE-674

Description

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.

Affected products

• nodemailer: before 10.0.2 — fixed in 10.0.2

How to fix

Upgrade to a fixed version: nodemailer 10.0.2. Check the vendor advisory for mitigations.

References

• https://github.com/nodemailer/nodemailer/security/advisories/GHSA-8vvx-rff5-p5rq
• https://www.vulncheck.com/advisories/nodemailer-before-10.0.2-stack-exhaustion-via-nested-recipient-arrays

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