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CVE-2026-25731

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

Published: Feb 6, 2026Updated: Feb 17, 2026 Sources: CVE List NVDCWE-1336
NVD MITRE
7.8CVSSHIGH
EPSS Score
0.2%
Top 85.1%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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 Vector Breakdown

AV:LAC:LPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-1336

Affected Products

calibrekovidgoyal
On-prem
Consumer Software / productivity
calibrecalibre-ebook
On-prem
Consumer Software / productivity
kovidgoyalindividual-devConsumer Softwareaka calibre, kitty
calibre-ebookoss-projectConsumer Softwareaka calibre

Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

References

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

Timeline

Published
Feb 6, 2026
Last Updated
Feb 17, 2026

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