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Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 1.3%
CVSS Severity
CVSS v3 Score 5.0
Products affected by CVE-2026-30853


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