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EPSS 1.1%top 36%

Nodemailer before 8.0.4 is vulnerable to SMTP command injection through the unsanitized envelope.size parameter. (CVE-2026-82854)

0
Critical
Published: 08/31/2026 (08/31/2026, 09:30:30 UTC)
Source: GCVE Database

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.

CVSS v3.1

Score 9.8critical

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Technical Details

Gcve Source
db.gcve.eu
Osv Id
GHSA-2x76-7hhq-pgvw
Osv Schema Version
1.4.0
Aliases
["CVE-2026-82854"]
Ecosystems
[]
Database Specific Severity
CRITICAL
Cvss Version
3.1

Threat ID: 6a95a0f1acd9273b4947e23b

Added to database: 08/31/2026, 15:42:41 UTC

Last updated: 08/31/2026, 22:52:14 UTC

Views: 4

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