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CVE-2026-44209— Banks: Critical Remote Code Execution (RCE) via Jinja2 SSTI

Quick assessment

Affected
masci banks
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.

banks是Massimiliano Pippi个人开发者的一个用于生成LLM提示的模板语言工具。 banks 2.4.2之前版本存在安全漏洞，该漏洞源于使用未沙箱化的jinja2.Environment()渲染提示模板，应用程序将用户提供的字符串作为Prompt()的模板参数时可能导致服务器端模板注入，进而导致远程代码执行。

CVSS 7.5 · High EPSS 0.74% · P53

Affected Version Matrix 1

VendorProduct Version RangeStatus
masci banks < 2.4.2 affected
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I. Basic Information for CVE-2026-44209

Vulnerability Information
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Vulnerability Title
Banks: Critical Remote Code Execution (RCE) via Jinja2 SSTI
Source: CVE Program / CVE List V5
Vulnerability Description
Banks generates meaningful LLM prompts using a template language that makes sense. Prior to 2.4.2, banks uses jinja2.Environment() (unsandboxed) to render prompt templates. Applications that pass user-supplied strings as the template argument to Prompt() are vulnerable to Server-Side Template Injection (SSTI), which can lead to Remote Code Execution (RCE) on the host system. This vulnerability is fixed in 2.4.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/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
banks 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
banks是Massimiliano Pippi个人开发者的一个用于生成LLM提示的模板语言工具。 banks 2.4.2之前版本存在安全漏洞，该漏洞源于使用未沙箱化的jinja2.Environment()渲染提示模板，应用程序将用户提供的字符串作为Prompt()的模板参数时可能导致服务器端模板注入，进而导致远程代码执行。
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
masci banks < 2.4.2 -

II. Public POCs for CVE-2026-44209

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7707 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-44209

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Patches & Fixes for CVE-2026-44209 (1)

Vendor Advisories for CVE-2026-44209 (1)

IV. Related Vulnerabilities

Same product: banks
Same vendor: masci
Same weakness: CWE-1336

V. Comments for CVE-2026-44209

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