CVE-2026-30853 | BDVDB-2026-320365 Detail

kovidgoyalcalibre

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.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact low, availability impact low. Attack vector: local.

Weaknesses#

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

References#

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

Exploit#

No public exploit known

History#

Version 12026-03-13Record published in the CVE List.

Published

Published: 2026-03-13
Last modified: 2026-03-13

Vendor information

Vendor: kovidgoyal
Product: calibre

All kovidgoyal vulnerabilities

Score

5.0 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 12.0.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Path Traversal

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 9.5.0
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

5.0 Medium

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L

Metric breakdown
Attack Vector	Local
Attack Complexity	Low
Privileges Required	None
User Interaction	Required
Scope	Changed
Confidentiality	None
Integrity	Low
Availability	Low

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).