CVE-2026-25635

Published: Feb 6, 2026Modified: Jun 17, 2026

8.6

Vector

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

Exploitability: 1.8 / Impact: 6.0

Source: security-advisories@github.com (Secondary)

Description

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 to Remote Code Execution by writing a payload to the Startup folder, which executes on next login. This vulnerability is fixed in 9.2.0.

Affected (1)

Products: Calibre Ebook: Calibre

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Calibre Ebook Calibre	Before 9.2.0

Related CWEs

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

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

References (3)

https://github.com/kovidgoyal/calibre/commit/9739232fcb029ac15dfe52ccd4fdb4a07ebb6ce9

Source: security-advisories@github.com

Patch

https://github.com/kovidgoyal/calibre/security/advisories/GHSA-32vh-whvh-9fxr

Source: security-advisories@github.com

ExploitThird Party Advisory

https://0x5t.raptx.org/posts/calibre-chm-rce

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitThird Party Advisory

Timeline

No history available yet.