What’s Vulnerable › Vulnerabilities

CVE-2026-82662: Nodemailer before 8.0.8 TLS Certificate Validation Bypass

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-31 · updated 2026-09-10
• Weakness: CWE-295

Description

Nodemailer before 8.0.8 disables TLS certificate verification in lib/fetch/index.js through rejectUnauthorized: false, allowing attackers to intercept OAuth2 token requests. Attackers in a machine-in-the-middle position can capture OAuth client secrets, refresh tokens, and access tokens transmitted over compromised HTTPS connections.

Affected products

• nodemailer: before 8.0.8 — fixed in 8.0.8

How to fix

Upgrade to a fixed version: nodemailer 8.0.8. Check the vendor advisory for mitigations.

References

• https://github.com/nodemailer/nodemailer/security/advisories/GHSA-r7g4-qg5f-qqm2
• https://www.vulncheck.com/advisories/nodemailer-before-8.0.8-tls-certificate-validation-bypass
• https://github.com/nodemailer/nodemailer/security/advisories/GHSA-r7g4-qg5f-qqm2

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