CVE-2026-27492 Lettermint Node.js SDK leaks email properties to unintended recipients when client instance is reused

Lettermint Node.js SDK is the official Node.js SDK for Lettermint. In versions 1.5.0 and below, email properties such as to, subject, html, text, and attachments are not reset between sends when a single client instance is reused across multiple .send calls. This can cause properties from a...