What is CVE-2026-25636?

CVE-2026-25636 is a high-severity vulnerability in Kovidgoyal Calibre, classified under Path Traversal. CVSS score: 8.2/10. Published 2026-02-06.

How severe is CVE-2026-25636?

High severity. CVSS v3 base score is 8.2 out of 10.

RCE in Kovidgoyal Calibre

CVE-2026-25636

calibre is an e-book manager. In 9.1.0 and earlier, a path traversal vulnerability in Calibre's EPUB conversion allows a malicious EPUB file to corrupt arbitrary existing files writable by the Calibre process. During conversion, Calibre re…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.000 (8.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H.

Affected products

Kovidgoyal Calibre — versions < 9.2.0

Weakness classification (CWE)

References

https://github.com/kovidgoyal/calibre/security/advisories/GHSA-8r26-m7j5-hm29 (x_refsource_CONFIRM)
https://github.com/kovidgoyal/calibre/commit/9484ea82c6ab226c18e6ca5aa000fa16de598726 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-25636?: CVE-2026-25636 is a high-severity vulnerability in Kovidgoyal Calibre, classified under Path Traversal. CVSS score: 8.2/10. Published 2026-02-06.
How severe is CVE-2026-25636?: High severity. CVSS v3 base score is 8.2 out of 10.