What is CVE-2026-30853?

CVE-2026-30853 is a medium-severity vulnerability in Calibre-ebook Calibre, classified under Path Traversal. CVSS score: 5.0/10. Published 2026-03-13.

How severe is CVE-2026-30853?

Medium severity. CVSS v3 base score is 5.0 out of 10.

Path Traversal in Calibre-ebook Calibre

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/ebooks/rb/reader.py) allows an attacker t…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.002 (7.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L.

Affected products

Calibre-ebook Calibre
Kovidgoyal Calibre — versions < 9.5.0

Weakness classification (CWE)

CWE-22 — Path Traversal

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-30853?: CVE-2026-30853 is a medium-severity vulnerability in Calibre-ebook Calibre, classified under Path Traversal. CVSS score: 5.0/10. Published 2026-03-13.
How severe is CVE-2026-30853?: Medium severity. CVSS v3 base score is 5.0 out of 10.