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MEDIUM · 5.0

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/eb...

Vulnerability 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.

CVSS Score

5.0

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
LOW

Affected Products

VendorProductVersions
Calibre-EbookCalibre< 9.5.0

Related Weaknesses (CWE)

CWE-22

References

FAQ

What is CVE-2026-30853?

CVE-2026-30853 is a vulnerability with a CVSS score of 5.0 (MEDIUM). 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/eb...

How severe is CVE-2026-30853?

CVE-2026-30853 has been rated MEDIUM with a CVSS base score of 5.0/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-30853?

Check the references section above for vendor advisories and patch information. Affected products include: Calibre-Ebook Calibre.