node-nodemailer: Nodemailer 3.0.0 before 10.0.13 has a regular expression denial of service in SMTPConnection._actionEHLO, whose four...
CVE-2026-110869 is fixed in node-nodemailer on 1 platform by DEBIAN-CVE-2026-110869 (version 10.0.13+~8.0.2-1), released October 16, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| node-nodemailer · Debian 14 | 10.0.13+~8.0.2-1 | DEBIAN-CVE-2026-110869 | Oct 16, 2026 |
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