Unauthorized email sending via unsanitized transport name
Published Aug 31, 2026 · Updated Aug 31, 2026
SMTP command injection in Nodemailer before 8.0.5 allows remote authenticated users to send unauthorized email via a crafted transport name. In lib/smtp-connection/index.js, the name value is concatenated into EHLO, HELO, and LHLO commands and written to the socket without stripping CR or LF. Exploitation requires control over the transport configuration and permits forged messages and recipient-control bypass through the configured SMTP server.
Summary
What happened
SMTP command injection in Nodemailer before 8.0.5 allows remote authenticated users to send unauthorized email via a crafted transport name. In lib/smtp-connection/index.js, the name value is concatenated into EHLO, HELO, and LHLO commands and written to the socket without stripping CR or LF. Exploitation requires control over the transport configuration and permits forged messages and recipient-control bypass through the configured SMTP server.
The record
- CVE
- CVE-2026-82853
- Published
- Aug 31, 2026
- Updated
- Aug 31, 2026
- Vendor
- Nodemailer
- Product
- Nodemailer
- Classifications
- CWE-93
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 31, 2026CVE publishedPublication date reported by the CVE source.
- Aug 31, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <8.0.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA-vvjj-xcjg-gr5g proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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