CVE-2026-50158— yutu: Arbitrary File Write via MCP `caption-download` Tool
Quick assessment
Affected
eat-pray-ai yutu
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.
以下是该漏洞描述的中文翻译： Yutu 是一款由 AI 驱动的 YouTube 频道管理与增长工具包。在 0.10.9 版本之前， MCP 工具通过 接受由调用方控制的 参数，并将其传递给 中的 函数。在该函数中， 会在未使用由 支持的 约束边界的情况下，创建或截断该路径对应的文件。 任何能够调用 的主体——包括在 MCP 服务器以默认配置运行（即未启用身份验证）时的本地 HTTP 客户端——都可以将下载的caption字节写入 之外、且可被 yutu 进程写入的任意路径。这可能会覆盖应用程序文件、配置文件、She
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-50158
Vulnerability Information
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Vulnerability Title
yutu: Arbitrary File Write via MCP `caption-download` Tool
Source: CVE Program / CVE List V5
Vulnerability Description
yutu is an AI-powered toolkit for managing and growing YouTube channels. Prior to 0.10.9, the caption-download MCP tool accepts a caller-controlled file parameter through cmd/caption/download.go and passes it to Caption.Download() in pkg/caption/caption.go, where os.Create() creates or truncates that path without using the pkg.Root confinement boundary backed by YUTU_ROOT. A principal able to invoke caption-download, including a local HTTP client when the MCP server runs with its default authentication-disabled configuration, can write downloaded caption bytes to any path writable by the yutu process outside YUTU_ROOT. This can overwrite application files, configuration, shell startup files, logs, or data and can cause persistent code execution or denial of service depending on the selected writable target. Live caption retrieval also requires usable service credentials and an accessible caption identifier. This issue is fixed in version 0.10.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
文件名或路径的外部可控制
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| eat-pray-ai | yutu | < 0.10.9-dev1 | - |
|
II. Public POCs for CVE-2026-50158
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-50158 (1)
Vendor Advisories for CVE-2026-50158 (1)
Vendor Pages for CVE-2026-50158 (1)
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🔗 Release v0.10.9 · eat-pray-ai/yutu · GitHub x_refsource_MISC
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V. Comments for CVE-2026-50158
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