CVE-2026-54316
- Source
- https://cve.org/CVERecord?id=CVE-2026-54316
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54316.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-54316
- Aliases
- Downstream
- Published
- 2026-06-23T17:06:16.184Z
- Modified
- 2026-07-08T08:13:44.936462223Z
- Severity
-
- 6.0 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Claude Code: Out-of-Band Data Exfiltration via Pre-Approved HuggingFace Domain in WebFetch
- Details
-
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.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54316.json", "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-183", "CWE-200", "CWE-515" ] }- References
Affected packages
Git / github.com/anthropics/claude-code
Affected ranges
- Type
- GIT
- Repo
- https://github.com/anthropics/claude-code
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Database specific
{ "source": [ "AFFECTED_FIELD", "CPE_RANGE" ], "cpe": "cpe:2.3:a:anthropic:claude_code:*:*:*:*:*:node.js:*:*", "extracted_events": [ { "introduced": "0.2.54" }, { "fixed": "2.1.163" } ] }