CVE-2026-38728 Details
Description
An issue in Nodemailer smtp_server before v.3.18.3 allows a remote attacker to cause a denial of service via the SMTPStream._write, lib/smtp-stream.js components
A denial-of-service vulnerability has been identified in the Nodemailer SMTP server package, specifically in versions prior to 3.18.3. The issue arises in the command parser of the SMTPStream._write method within the lib/smtp-stream.js file. Remote attackers can exploit this vulnerability by sending data without newline characters, causing the server's _remainder buffer to grow uncontrollably. This unchecked growth leads to excessive memory consumption, prolonged garbage collection pauses that freeze the event loop, and, in some cases, a process crash.
Users can upgrade to Nodemailer SMTP server version 3.18.3 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 15, 2026CISA-ADP
Assessed May 15, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://bytecreator.dev/blog/CVE-2026-38728 | CISA-ADP | ExploitTechnical Description |
| https://bytecreator.dev/blog/CVE-2026-38728 | [email protected] | ExploitTechnical Description |
| https://github.com/nodemailer/smtp-server | [email protected] | ProductVendor |
| https://github.com/nodemailer/smtp-server/releases/tag/v3.18.3 | [email protected] | Release NotesVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-400 | Uncontrolled Resource Consumption | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| Nodemailer smtp-server | All versions |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 15, 2026 | CVE Modified | CISA-ADP |
| May 15, 2026 | New CVE Received | [email protected] |