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CVE-2026-26065

Calibre-ebook Calibre path traversal

8.8 HIGHPublic exploitEPSS 0.56%
  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 are vulnerable to Path Traversal through PDB readers (both 132-byte and 202-byte header variants) that allow arbitrary file writes with arbitrary extension and arbitrary content anywhere the user has write permissions. Files are written in 'wb' mode, silently overwriting existing files. This can lead to potential code execution and Denial of Service through file corruption. 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-2026-26065 being actively exploited?

CVE-2026-26065 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.56%.

How severe is CVE-2026-26065?

CVE-2026-26065 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.56% probability of exploitation.

Which products are affected by CVE-2026-26065?

Affected products include Calibre-ebook Calibre.

How do I fix CVE-2026-26065?

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-2026-26065 against the real software inventory on every managed device, every day. 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.