Model Context Protocol3 min read
Hidden command in Claude Code: base64 piped to sh
Claude Code packed a hidden command in base64 and piped decode into sh. HOL Guard paused it. Allow just this once or Keep blocked.
By HOL GuardHCS (Hashgraph Consensus Service) Blog
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Originally published by HCS (Hashgraph Consensus Service) Blog on Sep 15, 2026.
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