CVE-2026-110203 in Roo-Code
Summary
by MITRE • 10/13/2026
Roo Code through 3.54.0 contains a command approval bypass vulnerability that allows attackers to auto-approve denied shell commands by abusing quote-masking regex in parseCommandLine(). Attackers can use indirect prompt injection with escaped or single-quoted double quotes to hide command separators behind allowlisted prefixes like echo, executing commands without user approval.
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Analysis
by VulDB Data Team • 10/14/2026
Roo Code versions up through 3.54.0 are susceptible to a critical security flaw classified as a command approval bypass vulnerability. This issue stems from an insufficient validation mechanism within the parseCommandLine function, which is responsible for interpreting and sanitizing shell commands before execution. The core technical deficiency lies in how the application handles quote masking during regular expression parsing. Specifically, the regex logic fails to correctly identify or neutralize escaped characters and single-quoted double quotes that are used to obfuscate command separators such as semicolons or ampersands. This oversight allows an attacker to construct malicious inputs where dangerous commands are hidden behind seemingly benign, allowlisted prefixes like echo. By leveraging indirect prompt injection techniques, the vulnerability enables unauthorized execution of shell commands without requiring explicit user approval, effectively circumventing the intended security controls designed to prevent arbitrary code execution.
The operational impact of this vulnerability is severe, as it compromises the integrity and confidentiality of systems running Roo Code. An attacker who can inject these crafted prompts into an interactive session or automated workflow can execute arbitrary system commands with the privileges of the user or service account executing the application. This capability facilitates a wide range of malicious activities, including data exfiltration, installation of backdoors, lateral movement within a network, and complete compromise of the underlying host environment. Because the bypass relies on obfuscating command separators behind allowlisted strings, it is particularly dangerous in environments where strict whitelisting policies are employed to restrict shell access. The vulnerability effectively renders these controls ineffective against sophisticated attackers who understand how to exploit parsing ambiguities in regex-based sanitizers.
From a classification perspective, this flaw aligns with CWE-78 Improper Neutralization of Special Elements used in an OS Command and CWE-200 Exposure of Sensitive Information through Discretionary Access Control if the executed commands lead to data leakage. In terms of offensive security frameworks, it maps directly to MITRE ATT&CK technique T1620 Abuse Execution Guardrails which involves bypassing restrictions on software execution or command invocation. The use of indirect prompt injection further connects this vulnerability to techniques associated with LLM-based application attacks where input manipulation leads to unintended system behavior.
To mitigate this risk, immediate updates to Roo Code beyond version 3.54.0 are required if a patch has been released by the vendor. In the interim, organizations should implement strict input validation that rejects any shell commands containing escaped quotes or complex quoting structures unless absolutely necessary for legitimate functionality. Security teams should also enforce least-privilege principles by running Roo Code with minimal system permissions to limit the blast radius of potential command execution. Additionally, deploying runtime application self-protection tools or network-level monitoring can help detect anomalous shell activity that originates from unexpected sources or contains unusual character sequences indicative of injection attempts. Regular security audits focusing on how third-party libraries handle string parsing and regex matching are essential to prevent similar vulnerabilities in other components of the software stack.