CVE-2026-55408: Koodo-Reader

High severity, CVSS 8.4. EPSS: 0.2% chance of exploitation in the next 30 days.

Koodo Reader is an ebook reader. In version 2.3.0 and earlier, Koodo Reader is vulnerable to remote code execution through malicious EPUB files because the open-book IPC handler enables nodeIntegrationInSubFrames and EPUB chapter content is rendered with unsanitized innerHTML. An attacker can craft an EPUB book that, when imported and opened by the victim, instantiates a hidden iframe with Node.js API access and executes arbitrary operating system commands with the victim user's privileges. This issue is fixed in version 2.3.1.

Affected products

• Koodo-Reader Koodo-Reader: before 2.3.1 (fixed in 2.3.1)

Published 2026-07-07. Last modified 2026-07-08.