CVE-2026-54316
CVE-2026-54316 · Claude Code: Out-of-Band Data Exfiltration via Pre-Approved HuggingFace Domain in WebFetch
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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.
CVSS 6.0 · Moyenne · EPSS 0,5% · Correctif disponible
- Publication
- Mise à jour
Pile logicielle: node
Produits et versions concernés
claude-code
- Versions du logiciel
- >= 0.2.54, < 2.1.163: Concernée
Aucun correctif publié
@anthropic-ai/claude-code npm
- Plages de versions concernées
- SEMVER: ≥ 0.2.54, < 2.1.163
Mettez à jour vers 2.1.163