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CVE-2026-121544

Koodo Reader through 2.4.6 Path Traversal via OPDS Cover and Download Handlers

Koodo Reader through 2.4.6 contains a path traversal vulnerability in the self-hosted HTTP server's OPDS handlers that allows authenticated attackers to read files outside the upload directory. Attackers can upload a crafted books.db with a cover value containing ../ sequences, then request /opds/cover/{key} to read files accessible to the server process.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Koodo-reader
Products
Koodo-reader
CVE-2026-55408

Koodo Reader: Remote code execution via malicious epub file

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.

CVSS 4.0 · 8.4 High EPSS < 1% KEV · Not listed
Vendors
Koodo-reader
Products
Koodo-reader