CVE-2026-77474 Dicklesworthstone CVE debrief

Who should care

Defenders and users of dcg versions prior to 0.6.6 should assess exposure and upgrade to version 0.6.6 or later. This includes operators, platform administrators, vulnerability management teams, and security teams who use or manage dcg. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Why it matters

A vulnerability in destructive_command_guard (dcg) allows a crafted command to hang dcg and bypass the guard via hook-timeout fail-open, fixed in version 0.6.6.

• Possible command bypass via crafted input
• Denial of service via resource exhaustion

Technical summary

The vulnerability is caused by exponential-time command-substitution preprocessing in dcg, which can be triggered by a destructive command followed by nested or unclosed $( or $(( sequences. This allows the destructive command to proceed. The affected scanners are reached through split_command_segments in src/packs/mod.rs. This issue is fixed in version 0.6.6. Defenders should prioritize assessing exposure and upgrading to version 0.6.6 or later. The vulnerability can be mitigated by reviewing compensating controls for exposed systems while remediation is scheduled and verified.

Defensive priority

Defenders should prioritize assessing exposure and upgrading to version 0.6.6 or later.

Recommended defensive actions

• Assess exposure by checking if using dcg versions prior to 0.6.6
• Upgrade to dcg version 0.6.6 or later
• Monitor for suspicious commands
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability is caused by exponential-time command-substitution preprocessing in dcg, which can be triggered by a destructive command followed by nested or unclosed $( or $(( sequences. The affected scanners are reached through split_command_segments in src/packs/mod.rs. A destructive command followed by nested or unclosed $( or $(( sequences causes 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.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.