Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-73248— calibre: Bypass of Python template restrictions via nested `template()` leading to RCE

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.

Kovidgoyal calibre是Kovidgoyal个人开发者的一款电子书管理软件。 Kovidgoyal calibre 9.12.0之前版本存在代码注入漏洞，该漏洞源于处理恶意EPUB、OPF、PDF等文件中的composite_template元数据时，嵌套template()调用未正确继承allow_python_templates=False，导致攻击者可执行任意Python代码。

CVSS 8.5 · High EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1059.004 · Unix Shell

Affected Version Matrix 1

VendorProduct Version RangeStatus
kovidgoyal calibre < 9.12.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-73248

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
calibre: Bypass of Python template restrictions via nested `template()` leading to RCE
Source: CVE Program / CVE List V5
Vulnerability Description
calibre is an e-book manager. Prior to 9.12.0, calibre processes attacker-controlled composite_template metadata from a malicious EPUB, OPF, PDF, or similar file through program: and a nested template() call whose formatter does not inherit allow_python_templates=False, allowing a nested python: template to reach compile_python_template and execute arbitrary Python code when the file is opened or imported. This issue is fixed in version 9.12.0.
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
Kovidgoyal calibre 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kovidgoyal calibre是Kovidgoyal个人开发者的一款电子书管理软件。 Kovidgoyal calibre 9.12.0之前版本存在代码注入漏洞，该漏洞源于处理恶意EPUB、OPF、PDF等文件中的composite_template元数据时，嵌套template()调用未正确继承allow_python_templates=False，导致攻击者可执行任意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 < 9.12.0 -

II. Public POCs for CVE-2026-73248

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10869 chars
Pro+ exclusive includes:
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
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-73248

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-73248 (1)

Vendor Advisories for CVE-2026-73248 (1)

Vendor Pages for CVE-2026-73248 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-73248

No comments yet

Leave a comment