Nodemailer 3.0.0 before 10.0.13 has a regular expression denial of service in SMTPConnection._actionEHLO, whose four AUTH mechanism detection regexes contain overlapping whitespace sub-patterns that backtrack quadratically. A malicious or man-in-the-middle SMTP server can reply to EHLO with 250-AUTH, a long whitespace run and a non-matching token, blocking the Node.js event loop for tens of seconds to hours before authentication.
Metrics
Affected Vendors & Products
Advisories
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Fixes
Solution
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Workaround
No workaround given by the vendor.
References
History
Wed, 14 Oct 2026 23:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Nodemailer 3.0.0 before 10.0.13 has a regular expression denial of service in SMTPConnection._actionEHLO, whose four AUTH mechanism detection regexes contain overlapping whitespace sub-patterns that backtrack quadratically. A malicious or man-in-the-middle SMTP server can reply to EHLO with 250-AUTH, a long whitespace run and a non-matching token, blocking the Node.js event loop for tens of seconds to hours before authentication. | |
| Title | Nodemailer 3.0.0 before 10.0.13 ReDoS via SMTP AUTH Mechanism Detection Regexes | |
| First Time appeared |
Nodemailer
Nodemailer nodemailer |
|
| Weaknesses | CWE-1333 | |
| CPEs | cpe:2.3:a:nodemailer:nodemailer:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Nodemailer
Nodemailer nodemailer |
|
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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MITRE
Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-10-14T22:52:57.866Z
Reserved: 2026-10-14T22:21:21.396Z
Link: CVE-2026-110869
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-10-14T23:17:28.673
Modified: 2026-10-14T23:17:28.673
Link: CVE-2026-110869
Redhat
No data.
OpenCVE Enrichment
No data.
Weaknesses