CVE-2026-33205 PUBLISHED

calibre has Server-Side Request Forgery in ebook viewer backend

Assigner: GitHub_M
Reserved: 17.03.2026 Published: 27.03.2026 Updated: 27.03.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 4.8

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	Passive

CVSS 4.0

Product Status

Vendor	kovidgoyal
Product	calibre
Versions	Version < 9.6.0 is affected

References

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

Problem Types

CWE-918: Server-Side Request Forgery (SSRF) CWE