CVE WatchAug 31, 2026

CVE-2026-82854

Nodemailer before 8.0.4 is vulnerable to SMTP command injection through the unsanitized envelope.size parameter. When an application passes

CVSS

9.8

Critical

EPSS

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KEV

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Exploit Today

0-100

Published: Aug 31, 2026 · Last modified: Aug 31, 2026 · CWE-93

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

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