CVE-2026-30853

calibre has a Path Traversal Leading to Arbitrary File Write

State: Published
Severity: 5.0 Medium
Published: Mar 13, 2026
Updated: Mar 13, 2026
Reserved: Mar 5, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.0 Medium	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L	GitHub_M

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected Products

Product	Versions
calibrekovidgoyal	< 9.5.0Affected

References

https://github.com/kovidgoyal/calibre/security/advisories/GHSA-7mp7-rfrg-542x

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