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CVE-2026-33206

HIGH CVSS 4.0: 8.2 EPSS 0.01%
Updated Mar 30, 2026
Calibre-Ebook
Parameter Value
CVSS 8.2 (HIGH)
Affected Versions before 9.6.0
Fixed In 9.6.0
Type CWE-23 (Relative Path Traversal)
Vendor Calibre-Ebook
Public PoC No

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.

Attack Parameters

Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
Passive
Minimal interaction

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption

CVSS Vector v4.0

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Calibre-Ebook Calibre
cpe:2.3:a:calibre-ebook:calibre:*:*:*:*:*:*:*:*
9.6.0