CVE-2026-77474

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

CVSS score

7.1

EPSS probability

%0.1

Risk score

0.0

Published

2 d ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

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Vulnerability description

CVE AI research

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DayBreach AI Explanation

Verified against sources

CVE-2026-77474: Exponential-Time Command-Substitution Preprocessing Vulnerability in destructive_command_guard

Sources read

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

CVE-2026-77474 is a vulnerability in destructive_command_guard (dcg) where nested or unclosed command substitutions produce exponential-time work, causing dcg to hang and bypass the guard via hook-timeout fail-open [S0, S1].

Why does it matter?

This vulnerability allows destructive shell commands to bypass the safety check designed to block them before execution by AI coding agents, potentially leading to unauthorized command execution [S0, S1].

What should be done?

Update to version 0.6.6 or later [S0, S1]
Follow vendor advisories and patches [S0]

Chain of evidence and sources2 verified claims

0.6.6 öncesi sürümlerde iç içe veya kapatılmamış ikameler özyinelemeli olarak yeniden taranarak üstel zamanlı iş yükü üretir.

S0 · daybreach-canonical S1 · cvelist

Askıda kalan PreToolUse kancası başarısız açık (fail-open) davranarak yıkıcı komutun çalışmasına izin verir.

S0 · daybreach-canonical S1 · cvelist

Show the technical text from the sources

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.

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

CWE: CWE-400, CWE-407, CWE-693

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-77474 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	Dicklesworthstone	destructive_command_guard	View

Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
7.1	CVSS V31	HIGH	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H	NVD
7.1	CVSS V3_1	HIGH	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H	CVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-77474 is associated with the following CWEs:

CWE-400: Common Weakness Enumeration Entry CWE-400 CWE-407: Common Weakness Enumeration Entry CWE-407 CWE-693: Common Weakness Enumeration Entry CWE-693

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-77474 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim

PermissionsGerekmiyor

UserGerekiyor

Official Sources and Advisories

https://github.com/Dicklesworthstone/destructive_command_guard/security/advisories/GHSA-4cfr-w3v5-w5j5vendor-advisory https://github.com/Dicklesworthstone/destructive_command_guard/issues/189vendor-advisory https://github.com/Dicklesworthstone/destructive_command_guard/commit/ba16bdd074b045329dc0ca6ec9a08c44403cfe1bvendor-advisory https://github.com/Dicklesworthstone/destructive_command_guard/releases/tag/v0.6.6vendor-advisory

CVSS Vector Radar Chart

7.1 / 10

Vulnerability Scoring Details

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone required

User Interaction—

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)High

Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

Dicklesworthstone

Weakness Type (CWE & CAPEC)

CWE-400 CWE-407 CWE-693

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