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

Quick assessment

Affected
nodemailer nodemailer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nodemailer是nodemailer组织开源的一个在Node.js应用中发送电子邮件的模块。 Nodemailer 8.0.8之前版本存在加密问题漏洞，该漏洞源于在lib/fetch/index.js中通过rejectUnauthorized: false禁用TLS证书验证，可能导致攻击者拦截OAuth2令牌请求，中间人攻击者可捕获OAuth客户端密钥、刷新令牌和访问令牌。

CVSS 6.5 · Medium EPSS 0.19% · P8

Affected Version Matrix 2

VendorProduct Version RangeStatus
nodemailer nodemailer < 8.0.8 affected
8.0.8 unaffected
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I. Basic Information for CVE-2026-82662

Vulnerability Information
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Vulnerability Title
Nodemailer before 8.0.8 TLS Certificate Validation Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Nodemailer 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nodemailer是nodemailer组织开源的一个在Node.js应用中发送电子邮件的模块。 Nodemailer 8.0.8之前版本存在加密问题漏洞，该漏洞源于在lib/fetch/index.js中通过rejectUnauthorized: false禁用TLS证书验证，可能导致攻击者拦截OAuth2令牌请求，中间人攻击者可捕获OAuth客户端密钥、刷新令牌和访问令牌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nodemailer nodemailer 0 ~ 8.0.8 -

II. Public POCs for CVE-2026-82662

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III. Intelligence Information for CVE-2026-82662

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Other References for CVE-2026-82662 (2)

Same Patch Batch · nodemailer · 2026-08-31 · 7 CVEs total

CVE-2026-82854 9.8 CRITICAL Nodemailer before 8.0.3 SMTP Command Injection via envelope.size
CVE-2026-82659 7.1 HIGH nodemailer before 9.0.1 File Read and SSRF via raw option
CVE-2026-82660 5.4 MEDIUM Nodemailer jsonTransport bypasses disableFileAccess and disableUrlAccess
CVE-2026-82661 5.4 MEDIUM Nodemailer CRLF Injection via List-* Header Comments
CVE-2024-58379 5.3 MEDIUM nodemailer before 6.9.9 ReDoS via attachDataUrls parameter
CVE-2026-82853 4.9 MEDIUM Nodemailer before 8.0.5 SMTP Command Injection via CRLF

IV. Related Vulnerabilities

Same product: nodemailer
Same vendor: nodemailer
Same weakness: CWE-295

V. Comments for CVE-2026-82662

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