What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-16 · updated 2026-10-19
• Weakness: CWE-400

Description

destructive_command_guard (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 scanners are reached through split_command_segments in src/packs/mod.rs. a destructive command followed by nested or unclosed $( or $(( sequences. nested or unclosed $( and $(( sequences cause repeated rescanning of the remaining command suffix. a hung PreToolUse hook fails open, allowing the destructive command to proceed. This issue is fixed in version 0.6.6.

Affected products

• Dicklesworthstone destructive_command_guard: before 0.6.6

References

• https://github.com/Dicklesworthstone/destructive_command_guard/commit/ba16bdd074b045329dc0ca6ec9a08c44403cfe1b
• https://github.com/Dicklesworthstone/destructive_command_guard/issues/189
• https://github.com/Dicklesworthstone/destructive_command_guard/releases/tag/v0.6.6
• https://github.com/Dicklesworthstone/destructive_command_guard/security/advisories/GHSA-4cfr-w3v5-w5j5

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