kovidgoyal calibre up to 9.5.x path traversal

Summaryinfo

A vulnerability, which was classified as problematic, was found in kovidgoyal calibre up to 9.5.x. Affected by this vulnerability is an unknown functionality. Such manipulation leads to path traversal. This vulnerability is documented as CVE-2026-33206. The attack needs to be performed locally. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in kovidgoyal calibre up to 9.5.x. Affected by this issue is some unknown functionality. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-23. The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory. Impacted is confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-33206 since 03/18/2026. The exploitation is known to be easy. The attack needs to be approached locally. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1006.

The vulnerability scanner Nessus provides a plugin with the ID 304172 (Linux Distros Unpatched Vulnerability : CVE-2026-33206), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 9.6.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (304172). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• kovidgoyal

Name

• calibre

Version

• 9.0
• 9.1
• 9.2
• 9.3
• 9.4
• 9.5

Website

• Product: https://github.com/kovidgoyal/calibre/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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