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CVE-2026-25731— Calibre Affected by Arbitrary Code Execution via Server-Side Template Injection in Calibre HTML Export

Quick assessment

Affected
kovidgoyal calibre
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Calibre是印度Kovid Goyal个人开发者的一个开源免费的全能电子书阅读管理与格式转换工具。 calibre 9.2.0之前版本存在安全漏洞，该漏洞源于服务器端模板注入，可能导致执行任意代码。

CVSS 7.8 · High EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-25731

Vulnerability Information
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Vulnerability Title
Calibre Affected by Arbitrary Code Execution via Server-Side Template Injection in Calibre HTML Export
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1336
Source: CVE Program / CVE List V5
Vulnerability Title
Calibre 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Calibre是印度Kovid Goyal个人开发者的一个开源免费的全能电子书阅读管理与格式转换工具。 calibre 9.2.0之前版本存在安全漏洞，该漏洞源于服务器端模板注入，可能导致执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kovidgoyal calibre < 9.2.0 -

II. Public POCs for CVE-2026-25731

# POC Description Source Link Shenlong Link
1 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). https://github.com/dxlerYT/CVE-2026-25731 POC Details
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III. Intelligence Information for CVE-2026-25731

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Same Patch Batch · kovidgoyal · 2026-02-06 · 3 CVEs total

CVE-2026-25635 8.6 HIGH calibre has a Path Traversal Leading to Arbitrary File Write and Potential Code Execution
CVE-2026-25636 8.2 HIGH calibre has a Path Traversal Leading to Arbitrary File Corruption and Code Execution

IV. Related Vulnerabilities

Same product: calibre
Same vendor: kovidgoyal
Same weakness: CWE-1336

V. Comments for CVE-2026-25731

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