CVE-2026-33206: calibre has a path traversal vulnerability
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-33206?
CVE-2026-33206 is classified as a moderate severity vulnerability due to its potential for unauthorized file access.
How do I fix CVE-2026-33206?
To fix CVE-2026-33206, update Calibre to version 9.6.0 or later.
Who is affected by CVE-2026-33206?
CVE-2026-33206 affects all versions of Calibre prior to 9.6.0.
What types of files are involved in CVE-2026-33206?
CVE-2026-33206 involves images within Markdown and similar text-based files.
How can I mitigate the risks associated with CVE-2026-33206?
To mitigate risks from CVE-2026-33206, avoid using untrusted Markdown files and ensure you are running the latest version of Calibre.