CVE-2026-30853

CVE-2026-30853

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.

CVE-2026-30853

A flaw was found in Calibre, an e-book manager. A path traversal vulnerability in the RocketBook (.rb) input plugin allows an attacker to write arbitrary files to any location accessible by the Calibre process. This can be exploited when a user opens or converts a specially crafted .rb file, potentially leading to information disclosure, denial of service, or arbitrary code execution.

CVE-2026-30853

calibre is a cross-platform e-book manager for viewing, converting, ed ...