What’s Vulnerable › Vulnerabilities
CVE-2026-33205: calibre has Server-Side Request Forgery in ebook viewer backend
- Severity: medium (CVSS 5.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-03-27 · updated 2026-10-26
- Weakness: CWE-918
Description
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
- kovidgoyal calibre: before 9.6.0 — fixed in 9.6.0
How to fix
Upgrade to a fixed version: kovidgoyal calibre 9.6.0. Check the vendor advisory for mitigations.
References
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