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CVE-2026-61536— Banks: Unsafe importlib.import_module of attacker-controlled Tool.import_path in CompletionExtension allows RCE

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.

masci banks是masci的服务器软件。 Massimiliano Pippi banks 2.4.3之前版本存在代码注入漏洞，该漏洞源于对import_path字段缺乏验证和清理，允许攻击者通过工具调用执行任意代码。

CVSS 7.5 · High EPSS 0.51% · P42

Affected Version Matrix 1

VendorProduct Version RangeStatus
masci banks < 2.4.3 affected
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I. Basic Information for CVE-2026-61536

Vulnerability Information
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Vulnerability Title
Banks: Unsafe importlib.import_module of attacker-controlled Tool.import_path in CompletionExtension allows RCE
Source: CVE Program / CVE List V5
Vulnerability Description
Banks generates meaningful LLM prompts using a simple template language. In versions prior to 2.4.3, banks parses Tool JSON objects from the rendered body of {% completion %} blocks and later resolves their import_path field through importlib.import_module(...) + getattr(...) to obtain the callable that handles a tool call. There is no allowlist or sanitization on import_path, so any importable Python attribute (e.g. os.system, subprocess.getoutput) can be selected. When the LLM emits a tool_calls entry whose function.name matches the attacker-supplied tool name, the resolved callable is invoked with kwargs decoded from tool_call.function.arguments, yielding arbitrary code execution in the banks-hosting process. This is distinct from GHSA-gphh-9q3h-jgpp / CVE-2026-44209. That advisory was fixed in 2.4.2 by switching src/banks/env.py from Environment to SandboxedEnvironment. The fix does not touch src/banks/extensions/completion.py, and the unsafe import + getattr chain still executes on 2.4.2. The malicious Tool JSON is plain text in the rendered template body — it requires no Jinja attribute access, so the sandbox is irrelevant. This issue has been fixed in version 2.4.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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
Massimiliano Pippi banks 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
masci banks是masci的服务器软件。 Massimiliano Pippi banks 2.4.3之前版本存在代码注入漏洞，该漏洞源于对import_path字段缺乏验证和清理，允许攻击者通过工具调用执行任意代码。
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
masci banks < 2.4.3 -

II. Public POCs for CVE-2026-61536

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 11365 chars
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III. Intelligence Information for CVE-2026-61536

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Vendor Advisories for CVE-2026-61536 (1)

IV. Related Vulnerabilities

Same product: banks
Same vendor: masci
Same weakness: CWE-94

V. Comments for CVE-2026-61536

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