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Vulnerability record · CVE-2026-26064 · published 20 February 2026

CVE-2026-26064: Calibre-ebook calibre path traversal vulnerability

Calibre Ebook · Calibre

calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions 9.2.1 and below contain a Path Traversal vulnerability that allows arbitrary file writes anywhere the user has write permissions. On Windows, this leads to Remote Code Execution by writing a payload to the Startup folder, which executes on next login. Function extract_pictures only checks startswith('Pictures'), and does not sanitize '..' sequences. calibre's own ZipFile.extractall() in utils/zipfile.py does sanitize '..' via _get_targetpath(), but extract_pictures() bypasses this by using manual zf.read() + open(). This issue has been fixed in version 9.3.0.

9.3 CVSS 4.0 Critical EPSS 0.85% · top 43.5% CWE-22 · Path traversal
9.3CVSS 4.0 base score
0.85%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions 9.2.1 and below contain a Path Traversal vulnerability that allows arbitrary file writes anywhere the user has write permissions. On Windows, this leads to Remote Code Execution by writing a payload to the Startup folder, which executes on next login. Function extract_pictures only checks startswith('Pictures'), and does not sanitize '..' sequences. calibre's own ZipFile.extractall() in utils/zipfile.py does sanitize '..' via _get_targetpath(), but extract_pictures() bypasses this by using manual zf.read() + open(). This issue has been fixed in version 9.3.0.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

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

References

LinkTags
https://github.com/kovidgoyal/calibre/commit/e1b5f9b45a5e8fa96c136963ad9a1d35e6adac62 Patch
https://github.com/kovidgoyal/calibre/security/advisories/GHSA-72ch-3hqc-pgmp ExploitVendor 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%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%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-2026-26064), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.