CVE-2026-30853
highpriority · track · 33EPSS 0.002 · 8 %ileEUUSEPSS · scored 2026-10-28
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–8.2
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
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affected products (2)
Products and version ranges known to be affected.
also known as (2)
Other names and identifiers for this entity.
sources
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references (5)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/cve-2026-30853cnnvd
- https://calibre-ebook.com/Patchcnnvd
- https://github.com/kovidgoyal/calibre/security/advisories/GHSA-7mp7-rfrg-542xcnnvd
- https://github.com/kovidgoyal/calibre/security/advisories/GHSA-7mp7-rfrg-542xenisa_euvd
- https://github.com/kovidgoyal/calibre/security/advisories/GHSA-7mp7-rfrg-542xExploitVendor Advisorynvd
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