CVE-2026-54316

Описание

Claude Code is an agentic coding tool. From 0.2.54 until 2.1.163, because the hostname huggingface.co was pre-approved as a bare hostname for the WebFetch tool, any path on that domain—including attacker-controlled model repositories—was auto-approved without a permission prompt or being subject to --allowedTools restrictions. An attacker able to inject untrusted content into a Claude Code context could direct it to issue WebFetch requests against attacker-controlled repository files (e.g. /resolve/main/config.json), which HuggingFace counts as downloads server-side, creating a covert out-of-band channel for encoding and exfiltrating data Claude can access such as files, environment variables, or command output. Reliably exploiting this required the ability to add untrusted content into a Claude Code context window. This vulnerability is fixed in 2.1.163.

A flaw was found in Claude Code, an agentic coding tool. An attacker could exploit a misconfiguration in the tool's web request functionality, known as WebFetch, where the huggingface.co domain was pre-approved without proper path restrictions. By injecting untrusted content into a Claude Code session, an attacker could direct the tool to make requests to their controlled files on HuggingFace. This creates a hidden channel to steal sensitive data, such as files or environment variables, that Claude Code can access. The primary impact of this vulnerability is the unauthorized disclosure of information.