{
 "id": "AIR-2026-0762",
 "slug": "cve-2026-54316-claude-code-out-of-band-data-exfiltration-via",
 "title": "CVE-2026-54316: Claude Code Out-of-Band Data Exfiltration via WebFetch",
 "summary": "Pre-approval of huggingface.co in Claude Code's WebFetch tool allowed automatic requests to attacker-controlled repositories without permission prompts. This created a covert channel for data exfiltration via server-side download metrics.",
 "type": "attack_on_ai",
 "categories": [
  "agent_hijack",
  "infra_vuln"
 ],
 "severity": 2,
 "targets": [
  "Anthropic",
  "framework_or_tooling"
 ],
 "products": [
  "Claude Code"
 ],
 "incident_date": "2026-06-17",
 "incident_date_precision": "day",
 "first_reported": "2026-06-17",
 "sources": [
  {
   "url": "https://github.com/advisories/GHSA-fg94-h982-f3mm",
   "publisher": "GitHub Advisory Database",
   "title": "CVE-2026-54316: Claude Code: Out-of-Band Data Exfiltration via Pre-Approved HuggingFace Domain in WebFetch",
   "published_at": "2026-06-17"
  },
  {
   "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54316",
   "publisher": "NVD",
   "title": "CVE-2026-54316: Claude Code is an agentic coding tool.",
   "published_at": "2026-06-23"
  }
 ],
 "source_count": 2,
 "confidence": 0.95,
 "status": "published",
 "origin": "seed_ghsa",
 "tags": [
  "CVE-2026-54316",
  "claude-code",
  "data-exfiltration"
 ],
 "created_at": "2026-10-18T07:00:14.101Z",
 "updated_at": "2026-10-18T10:04:21.885Z"
}