kovidgoyal calibre up to 9.2.x path traversal

Summaryinfo

A vulnerability, which was classified as critical, was found in kovidgoyal calibre up to 9.2.x. This issue affects some unknown processing. The manipulation results in path traversal. This vulnerability is identified as CVE-2026-26065. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in kovidgoyal calibre up to 9.2.x. Affected is some unknown functionality. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions 9.2.1 and below are vulnerable to Path Traversal through PDB readers (both 132-byte and 202-byte header variants) that allow arbitrary file writes with arbitrary extension and arbitrary content anywhere the user has write permissions. Files are written in 'wb' mode, silently overwriting existing files. This can lead to potential code execution and Denial of Service through file corruption. This issue has been fixed in version 9.3.0.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-26065 since 02/10/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. 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 299680 (Linux Distros Unpatched Vulnerability : CVE-2026-26065), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 9.3.0 eliminates this vulnerability. Applying the patch b6da1c3878c06eb1356cb0ec1106cb66e0e9bfb8 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (299680). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• kovidgoyal

Name

• calibre

Version

• 9.0
• 9.1
• 9.2

License

• open-source

Website

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

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Once again VulDB remains the best source for vulnerability data.

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