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Vulnerability record · CVE-2026-82662 · published 31 August 2026

CVE-2026-82662: Improper certificate validation vulnerability

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.

8.3 CVSS 4.0 High EPSS 0.19% · top 92.0% CWE-295 · Improper certificate validation Awaiting Analysis
8.3CVSS 4.0 base score
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
10 Sep 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-82662), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.