CVE-2026-54316

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 v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/anthropics/claude-code/security/advisories/GHSA-fg94-h982-f3mm	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:anthropic:claude_code:*:*:*:*:*:node.js:*:*

History

29 Jun 2026, 19:09

Type	Values Removed	Values Added
First Time		Anthropic Anthropic claude Code
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.1
CPE		cpe:2.3:a:anthropic:claude_code::::::node.js::*
References	~~() https://github.com/anthropics/claude-code/security/advisories/GHSA-fg94-h982-f3mm -~~	() https://github.com/anthropics/claude-code/security/advisories/GHSA-fg94-h982-f3mm - Third Party Advisory

23 Jun 2026, 18:18

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-23 18:18

Updated : 2026-06-29 19:09

NVD link : CVE-2026-54316

Mitre link : CVE-2026-54316

CVE.ORG link : CVE-2026-54316

JSON object : View

Products Affected

anthropic

claude_code

CWE

CWE-183

Permissive List of Allowed Inputs

CWE-200

Exposure of Sensitive Information to an Unauthorized Actor

CWE-515

Covert Storage Channel

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