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Vulnerability record · CVE-2026-25636 · published 6 February 2026

CVE-2026-25636: Calibre-ebook calibre path traversal vulnerability

Calibre Ebook · Calibre

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 resolves CipherReference URI from META-INF/encryption.xml to an absolute filesystem path and opens it in read-write mode, even when it points outside the conversion extraction directory. This vulnerability is fixed in 9.2.0.

7.8 CVSS 3.1 High EPSS 0.16% · top 95.6% CWE-22 · Path traversalCWE-73 · CWE-73
7.8CVSS 3.1 base score
0.16%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. 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 resolves CipherReference URI from META-INF/encryption.xml to an absolute filesystem path and opens it in read-write mode, even when it points outside the conversion extraction directory. This vulnerability is fixed in 9.2.0.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/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/9484ea82c6ab226c18e6ca5aa000fa16de598726 Patch
https://github.com/kovidgoyal/calibre/security/advisories/GHSA-8r26-m7j5-hm29 ExploitThird Party Advisory
https://0x5t.raptx.org/posts/calibre-epub-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%8.6CVE-2026-25635Calibre-ebook calibre path traversal vulnerabilitycalibre 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…EPSS 0.36%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%

Source: NIST National Vulnerability Database (record CVE-2026-25636), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.