CVE-2026-110869 Nodemailer - Denial of Service

Nodemailer < 10.0.13 contains a regular expression denial of service caused by overlapping whitespace sub-patterns in SMTPConnection._actionEHLO AUTH mechanism detection regexes, letting a malicious or man-in-the-middle SMTP server block the Node.js event loop, exploit requires interaction with a malicious SMTP server.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service, Man In The Middle
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
14 October 2026
Updated
15 October 2026
Weakness
CWE-1333

Vendor fix

Update to version 10.0.13 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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