CVE-2026-26065: calibre-ebook calibre Path Traversal

Vulnerability summary

CVE-2026-26065 is a critical (CVSS 9.3) Path Traversal vulnerability in calibre-ebook calibre. EPSS estimates a 0.62% chance of exploitation in the next 30 days, higher than 49.1% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 20-02-2026
   PublishedVulnerability first disclosed.
2. 20-02-2026
   Last modifiedVulnerability information updated.

Description

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.

• CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')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.