CVE-2026-33205

calibre has Server-Side Request Forgery in ebook viewer backend

State: Published
Severity: 4.8 Medium
Published: Mar 27, 2026
Updated: Mar 27, 2026
Reserved: Mar 17, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	4.8 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
calibrekovidgoyal	< 9.6.0Affected

References

https://github.com/kovidgoyal/calibre/security/advisories/GHSA-4926-v9px-wv7v

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