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CVE-2026-71492— Banks: Path traversal in `DirectoryPromptRegistry.set()` allows arbitrary file write outside the registry root

Quick assessment

Affected
masci banks
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Banks 使用一种简单的模板语言来生成有意义的 LLM（大型语言模型）提示词。在 2.4.5 版本之前，位于 中的 方法会将攻击者可控的 和 值直接插值到一个路径中，且未进行规范化或边界检查。攻击者可以通过使用类似 的相对路径遍历构造，或使用绝对路径来绕过或丢弃配置的注册表根目录；同时，若设置 ，则允许覆盖现有的目标文件。恶意构造的 会被持久化存储在 中，并在后续通过 方法重新加载，使得该路径仍可访问注册表根目录之外的位置。因此，若应用程序将请求数据直接传入这些字段，攻击者即可利用此漏洞，以应用程序进程可写的任意

CVSS 6.0 · Medium EPSS 0.32% · P25

Affected Version Matrix 1

VendorProduct Version RangeStatus
masci banks < 2.4.5 affected
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I. Basic Information for CVE-2026-71492

Vulnerability Information
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Vulnerability Title
Banks: Path traversal in `DirectoryPromptRegistry.set()` allows arbitrary file write outside the registry root
Source: CVE Program / CVE List V5
Vulnerability Description
Banks generates meaningful LLM prompts using a simple template language. Prior to version 2.4.5, DirectoryPromptRegistry.set() in src/banks/registries/directory.py interpolates attacker-controlled Prompt.name and Prompt.version values into a Path without canonicalization or containment validation. Relative traversal such as ../victim/foo and an absolute Prompt.name can escape or discard the configured registry root, while overwrite=True permits replacement of existing target files. The poisoned name is persisted in index.json and reconstructed by _load(), allowing the out-of-root path to survive later registry loads. An application that forwards request data into these fields can therefore write Prompt.raw bytes to attacker-chosen paths writable by the application process. This issue is fixed in version 2.4.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
masci banks < 2.4.5 -

II. Public POCs for CVE-2026-71492

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III. Intelligence Information for CVE-2026-71492

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Patches & Fixes for CVE-2026-71492 (2)

Vendor Advisories for CVE-2026-71492 (1)

Proof of Concept for CVE-2026-71492 (1)

IV. Related Vulnerabilities

Same product: banks
Same vendor: masci
Same weakness: CWE-22

V. Comments for CVE-2026-71492

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