CVE-2026-33206

MediumCVSS 6.3/10Last modified Oct 26, 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 path traversal vulnerability exists in Calibre' handling of images in Markdown and other similar text-based files allowing an attacker to include arbitrary files from the file system into the converted book. Additionally, missing authentication and server-side request forgery in the background-image endpoint in the ebook reader web view allow the files to be exfiltrated without additional interaction. Version 9.6.0 contains a fix.

Metrics

CVSS 3.1 6.3/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

Weakness enumeration

CWE-23

Affected software

Vendor	Product	Versions
kovidgoyal	calibre	< 9.6.0

References

https://github.com/kovidgoyal/calibre/security/advisories/GHSA-h3p4-m74f-43g6Exploit, Vendor Advisory
https://github.com/kovidgoyal/calibre/security/advisories/GHSA-h3p4-m74f-43g6Exploit, Vendor Advisory

Timeline

Published: Mar 27, 2026
Last modified: Oct 26, 2026
NVD status: Analyzed

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