EUVD-2026-12069CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L
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Description
calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to 9.5.0, a path traversal vulnerability in the RocketBook (.rb) input plugin (src/calibre/ebooks/rb/reader.py) allows an attacker to write arbitrary files to any path writable by the calibre process when a user opens or converts a crafted .rb file. This is the same bug class fixed in CVE-2026-26065 for the PDB readers, but the fix was never applied to the RB reader. This vulnerability is fixed in 9.5.0.
Analysis
Arbitrary file write vulnerability in Calibre's RocketBook input plugin enables attackers to write files to any location accessible by the Calibre process when a user opens or converts a malicious .rb file. The path traversal flaw affects versions prior to 9.5.0 and represents an unpatched instance of the same vulnerability class previously fixed in the PDB reader component. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Review file handling controls.
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