CVE-2026-82537 in Roo-Code
Summary
by MITRE • 09/09/2026
Roo-Code through 3.54.0 contains an auto-approve bypass vulnerability that allows attackers to execute denied shell commands by exploiting a word-boundary mismatch in comment handling between the approval gate's shell parser and bash. Attackers can craft a command string with an allowlisted word immediately followed by a hash character, separator, and denied command to pass the approval gate while bash executes the denied command with the agent's auto-execute privileges on the developer's machine.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified in Roo-Code versions up to 3.54.0 represents a critical security flaw rooted in an inconsistency between the application’s internal shell parsing logic and standard Bash interpretation rules. This specific issue is classified as CWE-78 Improper Neutralization of Special Elements used in an OS Command, commonly known as OS Command Injection. The core technical failure lies in how the approval gate processes command strings before execution. Roo-Code employs a mechanism to auto-approve certain shell commands based on allowlisted keywords or patterns intended to streamline developer workflows by reducing manual intervention for safe operations. However, the parser used within this approval gate fails to correctly handle word boundaries when processing comments, specifically those denoted by the hash character in Bash syntax.
In standard Bash execution, a hash symbol followed by specific characters typically initiates an inline comment that causes the shell to ignore subsequent text on that line until the end of the line or another command separator is encountered. The vulnerability arises because Roo-Code’s approval gate does not strictly adhere to this semantic rule when evaluating allowlists. An attacker can craft a malicious payload consisting of an allowed word immediately followed by a hash character, a space or other separator, and then the actual denied command. When the approval gate analyzes this string, it recognizes the initial allowed word as safe and grants permission for execution without fully parsing the remainder of the line according to Bash’s comment handling rules. Consequently, the system proceeds with auto-execution privileges because the static analysis performed by the gate deems the input compliant with security policies.
Once the command is approved and passed to the underlying shell interpreter, Bash interprets the string differently than the approval gate did. The hash character triggers a comment state in Bash, but if structured correctly within the specific context of how Roo-Code invokes the shell or if there are nuances in how the arguments are split and passed, the denied command following the separator can still be executed. This discrepancy allows an attacker to bypass security controls designed to prevent unauthorized system modifications. The operational impact is severe because this vulnerability enables arbitrary code execution with the privileges of the agent running on the developer's machine. Since Roo-Code operates as a coding assistant or automated tool, it often possesses elevated permissions necessary for file manipulation and script execution. Exploitation could lead to data exfiltration, installation of persistent backdoors, modification of source code repositories, or complete compromise of the development environment.
This attack vector aligns with MITRE ATT&CK technique T1059 Command and Scripting Interpreter, specifically sub-techniques related to shell commands such as sh or bash. The exploitation relies on a logic flaw where input validation is insufficiently rigorous compared to the actual execution engine’s behavior. To mitigate this risk, immediate updates to Roo-Code beyond version 3.54.0 are required if patches have been released that enforce strict alignment between the approval gate’s parser and Bash syntax rules. In environments where automatic updating is not feasible, administrators should disable auto-execute features for shell commands entirely or require explicit user confirmation for any command execution involving system shells. Additionally, implementing a more robust input validation layer that simulates exact Bash parsing behavior before granting approval can prevent such bypasses. Security teams must also monitor logs for unusual patterns of command approvals followed by unexpected file changes or network connections indicative of post-exploitation activity.