CVE-2026-25731

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

CVSS 7.8 HIGHEPSS 0.2%CWE-1336

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.8EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

06 Feb 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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

Affected products

kovidgoyal · calibre

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References

https://github.com/kovidgoyal/calibre/commit/f0649b27512e987b95fcab2e1e0a3bcdafc23379 https://github.com/kovidgoyal/calibre/security/advisories/GHSA-xrh9-w7qx-3gcc