What is CVE-2026-25635?

CVE-2026-25635 is a high-severity vulnerability in Kovidgoyal Calibre, classified under Path Traversal. CVSS score: 8.6/10. Published 2026-02-06.

How severe is CVE-2026-25635?

High severity. CVSS v3 base score is 8.6 out of 10.

Path Traversal in Kovidgoyal Calibre

CVE-2026-25635

calibre is an e-book manager. Prior to 9.2.0, Calibre's CHM reader contains a path traversal vulnerability that allows arbitrary file writes anywhere the user has write permissions. On Windows (haven't tested on other OS's), this can lead…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.001 (33.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Kovidgoyal Calibre — versions < 9.2.0

Weakness classification (CWE)

CWE-22 — Path Traversal

References

https://github.com/kovidgoyal/calibre/security/advisories/GHSA-32vh-whvh-9fxr (x_refsource_CONFIRM)
https://github.com/kovidgoyal/calibre/commit/9739232fcb029ac15dfe52ccd4fdb4a07ebb6ce9 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-25635?: CVE-2026-25635 is a high-severity vulnerability in Kovidgoyal Calibre, classified under Path Traversal. CVSS score: 8.6/10. Published 2026-02-06.
How severe is CVE-2026-25635?: High severity. CVSS v3 base score is 8.6 out of 10.