Bug 2526189 (CVE-2026-82854) - CVE-2026-82854 nodemailer: nodemailer: SMTP command injection via unsanitized envelope size parameter
Summary: CVE-2026-82854 nodemailer: nodemailer: SMTP command injection via unsanitized...
Keywords:
Status: NEW
Alias: CVE-2026-82854
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-31 09:04 UTC by OSIDB Bzimport
Modified: 2026-09-28 16:40 UTC (History)
21 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-08-31 09:04:02 UTC
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.


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