What’s Vulnerable › Vulnerabilities
CVE-2026-30853: calibre has a Path Traversal Leading to Arbitrary File Write
- Severity: high (CVSS 8.2 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-03-13 · updated 2026-06-17
- Weakness: CWE-22
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.
Affected products
- kovidgoyal calibre: before 9.5.0 — fixed in 9.5.0
How to fix
Upgrade to a fixed version: kovidgoyal calibre 9.5.0. Check the vendor advisory for mitigations.
References
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