CVE-2026-77474 dcg: Exponential-time command-substitution preprocessing lets a crafted command hang dcg and bypass the guard via hook-timeout fail-open

destructivecommandguard dcg is a command-line safety tool that blocks destructive shell commands before AI coding agents run them. Prior to 0.6.6, nested or unclosed substitutions are recursively rescanned after an inner scan returns unterminated, producing exponential-time work. The affected...