CVE-2026-50158
HighCVSS 7.7Exploitation Probability (EPSS)
Low risk12th percentile - higher than 12% of all known CVEs
Summary
yutu, an AI-powered toolkit for managing YouTube channels, prior to 0.10.9 allows writing files outside the permitted directory. The caption-download MCP tool accepts a caller-controlled file parameter that is passed to os.Create() without using the pkg.Root confinement boundary backed by YUTU_ROOT, enabling overwrite of any file writable by the process.
Risk Assessment
A principal able to invoke caption-download (including a local HTTP client when the MCP server runs with default authentication-disabled configuration) can overwrite application files, configuration, shell startup files, logs, or data, potentially causing persistent code execution or denial of service. Live caption retrieval additionally requires valid service credentials and an accessible caption identifier.
Recommendation
Upgrade yutu to version 0.10.9 or later. Until then, do not run the MCP server with authentication disabled and restrict the write permissions of the yutu process.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS