Bug 2447437 (CVE-2026-30853)

Summary: CVE-2026-30853 calibre: Calibre: Arbitrary file write via crafted RocketBook (.rb) file
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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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.
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Bug Depends On: 2447869    
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Description OSIDB Bzimport 2026-03-13 20:01:36 UTC
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.