CVE-2026-34752: Haraka Project Haraka

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Haraka is a Node.js mail server. Prior to version 3.1.4, sending an email with __proto__: as a header name crashes the Haraka worker process. This issue has been patched in version 3.1.4.

Affected products

• Haraka Project Haraka: before 3.1.4 (fixed in 3.1.4)

Published 2026-04-02. Last modified 2026-10-06.