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Vulnerability record · CVE-2026-25635 · published 6 February 2026

CVE-2026-25635: Calibre-ebook calibre path traversal vulnerability

Calibre Ebook · Calibre

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.

8.6 CVSS 3.1 High EPSS 0.36% · top 73.3% CWE-22 · Path traversal
8.6CVSS 3.1 base score
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/kovidgoyal/calibre/commit/9739232fcb029ac15dfe52ccd4fdb4a07ebb6ce9 Patch
https://github.com/kovidgoyal/calibre/security/advisories/GHSA-32vh-whvh-9fxr ExploitThird Party Advisory
https://0x5t.raptx.org/posts/calibre-chm-rce ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2011-4124Calibre-ebook calibre improper input validation vulnerabilityInput validation issues were found in Calibre at devices/linux_mount_helper.c which can lead to argument injection and elevation of privileges.EPSS 2.3%9.8CVE-2011-4125Calibre-ebook calibre untrusted search path vulnerabilityA untrusted search path issue was found in Calibre at devices/linux_mount_helper.c leading to the ability of unprivileged users to execute any progra…EPSS 2.3%9.3CVE-2026-26065Calibre-ebook calibre path traversal vulnerabilitycalibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions 9.2.1 and below are vulnerable to Path …EPSS 0.56%9.3CVE-2026-26064Calibre-ebook calibre path traversal vulnerabilitycalibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions 9.2.1 and below contain a Path Traversa…EPSS 0.85%8.2CVE-2026-33206Calibre-ebook calibre relative path traversal vulnerabilitycalibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.6.0, a path traversal vulnera…EPSS 0.22%8.2CVE-2026-30853Calibre-ebook calibre path traversal vulnerabilitycalibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to 9.5.0, a path traversal vulnerability i…EPSS 0.19%8.1CVE-2011-4126Calibre-ebook calibre toctou race condition vulnerabilityRace condition issues were found in Calibre at devices/linux_mount_helper.c allowing unprivileged users the ability to mount any device to anywhere.EPSS 1.5%7.8CVE-2026-25731Calibre-ebook calibre vulnerabilitycalibre is an e-book manager. Prior to 9.2.0, a Server-Side Template Injection (SSTI) vulnerability in Calibre's Templite templating engine allows ar…EPSS 0.26%

Source: NIST National Vulnerability Database (record CVE-2026-25635), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.