{"data":{"id":"d4ff5785-69f6-4e5d-b40a-f4b2958b640d","title":"GHSA-fg94-h982-f3mm: Claude Code: Out-of-Band Data Exfiltration via Pre-Approved HuggingFace Domain in WebFetch","summary":"Claude Code auto-approved any path on the huggingface.co domain for the WebFetch tool because the bare hostname was pre-approved, bypassing the permission prompt and --allowedTools restrictions. An attacker who can inject untrusted content into a Claude Code context can direct WebFetch requests to attacker-controlled repository files, which HuggingFace counts as downloads server-side, creating an out-of-band channel to exfiltrate data Claude can access, such as files, environment variables, or command output. Exploitation requires the ability to add untrusted content into the context window.","solution":"Users on standard Claude Code auto-update have already received the fix; users performing manual updates are advised to update to the latest version.","labels":["security"],"sourceUrl":"https://github.com/advisories/GHSA-fg94-h982-f3mm","publishedAt":"2026-06-17T18:06:06.000Z","cveId":"CVE-2026-54316","cweIds":null,"cvssScore":null,"cvssSeverity":"medium","severity":"medium","attackType":["prompt_injection","data_extraction"],"issueType":"vulnerability","affectedPackages":["@anthropic-ai/claude-code@>= 0.2.54, < 2.1.163 (fixed: 2.1.163)"],"affectedPackageNames":["@anthropic-ai/claude-code"],"affectedPackageRefs":["npm:@anthropic-ai/claude-code"],"affectedVendors":["Anthropic","HuggingFace"],"affectedVendorsRaw":["Claude Code","HuggingFace","WebFetch"],"classifierModel":"claude-haiku-5-5","classifierPromptVersion":"v4","summaryPromptVersion":"v2","headline":null,"headlinePromptVersion":null,"cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":"unknown","epssScore":0.0052,"epssCheckedAt":"2026-11-04T18:09:13.655Z","kevDateAdded":null,"advisoryAliases":["GHSA-fg94-h982-f3mm"],"affectedPackagesSource":null,"affectedPackagesCheckedAt":null,"patchAvailable":true,"disclosureDate":"2026-06-17T18:06:06.000Z","fixReleasedAt":"2026-06-04T17:56:01.880Z","daysToFix":-13,"fixCheckedAt":"2026-10-29T21:34:22.405Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["confidentiality"],"aiComponentTargeted":"agent","llmSpecific":true,"classifierConfidence":0.93,"researchCategory":null,"atlasIds":["AML.T0051"],"fixes":[{"ecosystem":"npm","name":"@anthropic-ai/claude-code","fixedVersion":"2.1.163","matchedVersion":"2.1.163","fixReleasedAt":"2026-06-04T17:56:01.880Z","daysToFix":-13,"match":"ecosystem","source":"registry","status":"found","checkedAt":"2026-10-29T21:34:22.255Z"}]}}