CVE-2026-30853CWE-22

calibre has a Path Traversal Leading to Arbitrary File Write

Medium · published March 13, 2026

CVSS v3.1
5.0
EPSS
0%
Percentile
8.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.0 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00195 · 8.7th percentile
Weakness
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2026-03-13T19:00Z
EPSS history
Timeline
  • 13 MAR 19:00Z
    calibre has a Path Traversal Leading to Arbitrary File Write
    cvelistv5