GCD AI RADAR
incidents/AIR-2026-0762

CVE-2026-54316: Claude Code Out-of-Band Data Exfiltration via WebFetch

Attack on AI2 Disclosed vulnerabilityAgent hijackInfrastructure vulnerability

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.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

Details

type
Attack on AI
An AI model, agent or AI-powered product was the thing exploited, abused or leaked.
categories
  • Agent hijackprimary
    An AI agent is tricked into unauthorized actions: tool misuse, data exfiltration through the agent, or acting against its principal.
  • Infrastructure vulnerability
    CVEs and advisories in AI frameworks, inference servers, MCP servers, AI developer tools and hosting stacks.
owasp llm top 10
mitre atlas
Both rows are derived from the type and categories (OWASP 2025 edition, ATLAS release 2026.09), not classified per record. How
severity
2 · Disclosed vulnerability
CVE or vendor advisory, patched or patchable, no confirmed exploitation.
targets
Anthropic, Framework / tooling
products
Claude Code
incident date
17 Jun 2026
first reported
17 Jun 2026
origin
GitHub Advisory Database
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
classifier confidence
0.95 · published at or above 0.80; see the methodology
tags
CVE-2026-54316 · claude-code · data-exfiltration
record
created 2026-10-18 07:00Z · updated 2026-10-18 10:04Z · json

Sources · 2

  1. 2026-06-17
    CVE-2026-54316: Claude Code: Out-of-Band Data Exfiltration via Pre-Approved HuggingFace Domain in WebFetch
    GitHub Advisory Database · github.com/advisories/GHSA-fg94-h982-f3mm
  2. 2026-06-23
    CVE-2026-54316: Claude Code is an agentic coding tool.
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-54316

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