Claude Code, shown its own exploit, says: 'This is a real bypass of the network sandbox filter.' Second Anthropic Claude Code sandbox bypass in five months.

Second Time, Same Sandbox: Another Anthropic Claude Code Network Sandbox Bypass Enables Data Exfiltration

A second Claude Code sandbox flaw let blocked network traffic through. Reproduction, affected versions, and the parsing mismatch behind the bypass.

May 20, 2026 · 12 min · 2546 words · Aonan Guan