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CVE-2026-53511— calibre: Arbitrary Code Execution in Template Formatter via Book Metadata

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.

Kovid Goyal Calibre是印度Kovid Goyal个人开发者开源的一个开源免费的全能电子书阅读管理与格式转换工具。 Kovid Goyal Calibre 9.10.0之前版本存在代码注入漏洞，该漏洞源于在模板格式化程序中将带python:模板的自定义列定义未清理传递给exec()，可能导致恶意EPUB、OPF或PDF文件在其元数据被读取时执行任意Python代码。

CVSS 8.5 · High EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
kovidgoyal calibre < 9.10.0 affected
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I. Basic Information for CVE-2026-53511

Vulnerability Information
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Vulnerability Title
calibre: Arbitrary Code Execution in Template Formatter via Book Metadata
Source: CVE Program / CVE List V5
Vulnerability Description
calibre is an e-book manager. Prior to 9.10.0, a malicious EPUB, OPF, or PDF file can execute arbitrary Python code when its metadata is read by calibre, including through Add books or Edit books, by embedding a custom column definition with a python: template in calibre:user_metadata that is passed unsanitized to exec() in the template formatter. This issue is fixed in version 9.10.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Kovid Goyal Calibre 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kovid Goyal Calibre是印度Kovid Goyal个人开发者开源的一个开源免费的全能电子书阅读管理与格式转换工具。 Kovid Goyal Calibre 9.10.0之前版本存在代码注入漏洞，该漏洞源于在模板格式化程序中将带python:模板的自定义列定义未清理传递给exec()，可能导致恶意EPUB、OPF或PDF文件在其元数据被读取时执行任意Python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 < 9.10.0 -

II. Public POCs for CVE-2026-53511

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6754 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-53511

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Patches & Fixes for CVE-2026-53511 (1)

Vendor Advisories for CVE-2026-53511 (1)

Vendor Pages for CVE-2026-53511 (1)

IV. Related Vulnerabilities

Same product: calibre
Same vendor: kovidgoyal
Same weakness: CWE-94

V. Comments for CVE-2026-53511

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