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.
History

Mon, 26 Oct 2026 19:45:00 +0000

Type Values Removed Values Added
First Time appeared Dicklesworthstone
Dicklesworthstone destructive Command Guard
Vendors & Products Dicklesworthstone
Dicklesworthstone destructive Command Guard

Mon, 19 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 16 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
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.
Title dcg: Exponential-time command-substitution preprocessing lets a crafted command hang dcg and bypass the guard via hook-timeout fail-open
Weaknesses CWE-400
CWE-407
CWE-693
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-16T16:10:57.120Z

Updated: 2026-10-19T12:38:04.696Z

Reserved: 2026-08-20T20:07:49.963Z

Link: CVE-2026-77474

cve-icon Vulnrichment

Updated: 2026-10-19T12:37:50.300Z

cve-icon NVD

Status : Deferred

Published: 2026-10-16T17:17:50.390

Modified: 2026-10-19T13:16:58.540

Link: CVE-2026-77474

cve-icon Redhat

No data.