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CVE-2026-25731

HighPublished

Calibre Affected by Arbitrary Code Execution via Server-Side Template Injection in Calibre HTML Export

Published: Feb 6, 2026
Updated: Feb 6, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 25, 2026

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 16.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-25731PoC
Proof of Concept for a Server-Side Template Injection (SSTI) vulnerability in Calibre’s Templite engine (GHSA-xrh9-w7qx-3gcc). Demonstrates arbitrary Python code execution via user-supplied HTML export templates in affected versions (≤ 9.1.0).

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