Is CVE-2026-30853 actively exploited?

No active exploitation of CVE-2026-30853 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-30853 be exploited remotely?

No. CVE-2026-30853 requires local access to exploit.

What is the CVSS score of CVE-2026-30853?

CVE-2026-30853 has a CVSS score of 8.2 (HIGH).

HOME VULNERABILITIESCVE-2026-30853

HIGH

CVE-2026-30853

CWE-22Published: March 13, 2026· Updated: Mar 18, 2026

8.2

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:1.3th

Official 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.

NVD Source

Technical Analysis

CVE-2026-30853 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.2.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.