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TI-2026-75364 Aliases CVE-2026-77474

Exponential-time parsing in dcg lets commands bypass the guard

Priority LOW 30CWE-400Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Denial of service, Security bypass
Confidentiality · integrity · availability
None · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-400 and CWE-693.

Summary

destructive_command_guard (dcg) before 0.6.6 recursively rescans nested or unclosed command substitutions, which causes exponential-time work (CWE-407). A local attacker can submit a destructive command followed by crafted nested or unclosed $( or $(( sequences to hang the tool. A hung PreToolUse hook fails open, so the destructive command proceeds unchecked.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00124 2nd percentileScored 2026-11-07
Fix Fixed destructive_command_guard (Dicklesworthstone): 0.6.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Dicklesworthstonedestructive_command_guardbefore 0.6.60.6.6Patch availableCNA
  • destructive_command_guard VendorDicklesworthstone Affected before 0.6.6 Fixed in 0.6.6 Patch available CNA

Remediation

Upgrade destructive_command_guard to version 0.6.6, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA destructive_command_guard (Dicklesworthstone) Fixed in 0.6.6

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-77474
  2. 2026-10-18 Priority changed: MEDIUM → LOW
  3. 2026-10-19 CISA SSVC decision points changed

References

Other 4

Sources

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