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Vulnerability record · CVE-2011-4126 · published 27 October 2021

CVE-2011-4126: Calibre-ebook calibre toctou race condition vulnerability

Calibre Ebook · Calibre

Race condition issues were found in Calibre at devices/linux_mount_helper.c allowing unprivileged users the ability to mount any device to anywhere.

8.1 CVSS 3.1 High EPSS 1.5% · top 26.1% CWE-367 · TOCTOU race condition
8.1CVSS 3.1 base score, v2 9.3
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 4 tagged exploit
16 Jun 2026Last modified by NVD

Description

Race condition issues were found in Calibre at devices/linux_mount_helper.c allowing unprivileged users the ability to mount any device to anywhere.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/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://bugs.launchpad.net/calibre/+bug/885027 ExploitIssue TrackingThird Party Advisory
https://git.zx2c4.com/calibre-mount-helper-exploit/about/ ExploitThird Party Advisory
https://lwn.net/Articles/464824/ Not ApplicableThird Party Advisory
https://www.openwall.com/lists/oss-security/2011/11/02/2 Mailing ListThird Party Advisory
https://bugs.launchpad.net/calibre/+bug/885027 ExploitIssue TrackingThird Party Advisory
https://git.zx2c4.com/calibre-mount-helper-exploit/about/ ExploitThird Party Advisory
https://lwn.net/Articles/464824/ Not ApplicableThird Party Advisory
https://www.openwall.com/lists/oss-security/2011/11/02/2 Mailing ListThird 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%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-2011-4126), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.