EUVD-2026-16612CVSS Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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3Description
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.
Analysis
Calibre versions prior to 9.6.0 allow remote attackers to exfiltrate arbitrary files from the host system through a combination of path traversal in image handling during file conversion and unauthenticated server-side request forgery in the ebook reader web view's background-image endpoint. An attacker can craft a malicious markdown or text-based file that references files outside the intended directory, then retrieve those files through the unprotected background-image handler without authentication, enabling complete file system disclosure on systems running vulnerable Calibre instances.
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Remediation
Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.
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