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CVE-2026-26064

Calibre-ebook Calibre remote code execution

8.8 HIGHPublic exploitEPSS 0.87%
  1. Published20 Feb 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Calibre-ebook Calibre< 9.3.0

Remediation

Fixed in
Calibre-ebook Calibre≥ 9.3.0

References

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Frequently asked

Is CVE-2026-26064 being actively exploited?

CVE-2026-26064 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.87%.

How severe is CVE-2026-26064?

CVE-2026-26064 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.87% probability of exploitation.

Which products are affected by CVE-2026-26064?

Affected products include Calibre-ebook Calibre.

How do I fix CVE-2026-26064?

Upgrade affected software to a fixed version, for example Calibre-ebook Calibre 9.3.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-26064 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.