Vulnerability in Nodemailer
CVE-2026-82662
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.
Vulnerability class: Improper Certificate Validation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (8.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 8.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/nodemailer/nodemailer/security/advisories/GHSA-r7g4-qg5f-qqm2 (vendor-advisory)
- www.vulncheck.com/advisories/nodemailer-before-8.0.8-tls-certificate-validation… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-82662?
- CVE-2026-82662 is a medium-severity vulnerability in Nodemailer, classified under Improper Certificate Validation. CVSS score: 6.5/10. Published 2026-08-31.
- How severe is CVE-2026-82662?
- Medium severity. CVSS v3 base score is 6.5 out of 10.