CVE-2026-26065 CRITICAL

CVE-2026-26065: calibre: Path Traversal can Lead to Arbitrary File Write and Potential Code Execution

Vendor Kovidgoyal
Product calibre
Weakness CWE-22 · Path traversal
Published February 20, 2026
Last update February 20, 2026

CVSS base score

9.3/10
Attack vector Local
Attack complexity Low
Privileges required None
User interaction
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 20, 2026 CVE published
February 20, 2026 Record updated