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CVE-2026-82854— Nodemailer before 8.0.3 SMTP Command Injection via envelope.size

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 8.0.4之前版本存在输入验证错误漏洞，该漏洞源于未对envelope.size参数进行清理，导致SMTP命令注入，攻击者可通过注入RCPT TO等命令静默添加受控收件人。

CVSS 9.8 · Critical EPSS 1.98% · P80

Affected Version Matrix 2

VendorProduct Version RangeStatus
nodemailer nodemailer < 8.0.3 affected
8.0.3 unaffected
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I. Basic Information for CVE-2026-82854

Vulnerability Information
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Vulnerability Title
Nodemailer before 8.0.3 SMTP Command Injection via envelope.size
Source: CVE Program / CVE List V5
Vulnerability Description
Nodemailer before 8.0.4 is vulnerable to SMTP command injection through the unsanitized envelope.size parameter. When an application passes a custom envelope object with a size property containing CRLF characters to sendMail(), the value is concatenated into the SMTP MAIL FROM command (as SIZE=...) without sanitization, allowing injection of arbitrary SMTP commands such as RCPT TO to silently add attacker-controlled recipients. Exploitation requires the application to expose the envelope size to attacker-controlled input, as Nodemailer does not include size in the default auto-constructed envelope.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Nodemailer 输入验证错误漏洞
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 8.0.4之前版本存在输入验证错误漏洞，该漏洞源于未对envelope.size参数进行清理，导致SMTP命令注入，攻击者可通过注入RCPT TO等命令静默添加受控收件人。
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 ~ 8.0.3 -

II. Public POCs for CVE-2026-82854

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III. Intelligence Information for CVE-2026-82854

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Other References for CVE-2026-82854 (2)

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

CVE-2026-82659 7.1 HIGH nodemailer before 9.0.1 File Read and SSRF via raw option
CVE-2026-82662 6.5 MEDIUM Nodemailer before 8.0.8 TLS Certificate Validation Bypass
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-93

V. Comments for CVE-2026-82854

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