CVE-2026-33205: Calibre-Ebook Calibre

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.6.0, a Server-Side Request Forgery vulnerability in the background-image endpoint of calibre e-book reader's web view allows an attacker to perform blind GET requests to arbitrary URLs and exfiltrate information out from the ebook sandbox. Version 9.6.0 patches the issue.

Affected products

• Calibre-Ebook Calibre: before 9.6.0 (fixed in 9.6.0)

Published 2026-03-27. Last modified 2026-06-17.