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CVE-2026-25731

Calibre-ebook Calibre vulnerability

7.8 HIGHPublic exploitEPSS 0.29%
  1. Published6 Feb 2026

Description

calibre is an e-book manager. Prior to 9.2.0, a Server-Side Template Injection (SSTI) vulnerability in Calibre's Templite templating engine allows arbitrary code execution when a user converts an ebook using a malicious custom template file via the --template-html or --template-html-index command-line options. This vulnerability is fixed in 9.2.0.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Calibre-ebook Calibre< 9.2.0

Remediation

Fixed in
Calibre-ebook Calibre≥ 9.2.0

References

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Frequently asked

Is CVE-2026-25731 being actively exploited?

CVE-2026-25731 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.29%.

How severe is CVE-2026-25731?

CVE-2026-25731 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 0.29% probability of exploitation.

Which products are affected by CVE-2026-25731?

Affected products include Calibre-ebook Calibre.

How do I fix CVE-2026-25731?

Upgrade affected software to a fixed version, for example Calibre-ebook Calibre 9.2.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-25731 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.