CVE-2026-51871 in Devika
Summary
by MITRE • 10/01/2026
Devika v1.0 is vulnerable to Code Injection in the Runner.execute function in src/agents/runner/runner.py which allows an attacker to achieve arbitrary code execution by exploiting the direct execution of LLM-generated content.
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Analysis
by VulDB Data Team • 10/01/2026
The vulnerability identified in Devika version 1.0 represents a critical security flaw rooted in improper neutralization of special elements used in an OS command, commonly classified under CWE-78 Improper Neutralization of Special Elements used in an Operating System Command. This specific issue resides within the Runner.execute function located in the src/agents/runner/runner.py module. The core technical failure involves the direct execution of content generated by a Large Language Model without adequate sanitization or validation checks. In this architecture, the LLM generates textual output that is subsequently passed directly to an operating system shell for execution. Because the input stream includes untrusted data derived from AI-generated responses, there is no boundary between trusted application logic and potentially malicious user-controlled payloads.
An attacker can exploit this flaw by manipulating the interaction with the Devika agent to produce specific LLM outputs that contain executable commands or scripts designed to run on the host system. Since the Runner.execute function does not filter out shell metacharacters such as semicolons, pipes, ampersands, or backticks, these characters allow an attacker to chain multiple commands together or break out of intended execution contexts. This capability effectively grants arbitrary code execution privileges at the level of the process running Devika. The severity is compounded by the fact that LLMs can be prompted using natural language instructions that bypass traditional input validation mechanisms designed for structured data formats, making this a sophisticated injection vector often associated with CWE-95 Improper Neutralization of Special Elements used in an HTML Tag or Command Injection depending on the execution context.
The operational impact of this vulnerability is severe, as it allows remote attackers to compromise the integrity and confidentiality of the underlying system. Successful exploitation could lead to unauthorized access to sensitive data, installation of malware, pivoting to other systems within a network, or complete denial of service through resource exhaustion commands. From an adversary perspective, this aligns with ATT&CK technique T1059 Command and Scripting Interpreter, where attackers use command-line interfaces to execute malicious code. The ability to inject arbitrary commands means that the attacker is not limited to simple information disclosure but can actively modify system configurations, exfiltrate credentials stored in environment variables or configuration files, and establish persistent access mechanisms if file write permissions are available.
Mitigation strategies must focus on implementing strict input validation and output encoding principles within the agent framework. The most effective immediate fix involves replacing direct shell execution with safer alternatives such as using language-specific libraries that do not invoke a shell interpreter, thereby preventing command chaining attacks. If shell invocation is unavoidable, all inputs derived from LLM outputs must be rigorously sanitized against known dangerous characters and patterns before being passed to the operating system. Additionally, implementing allow-lists for permitted commands can significantly reduce the attack surface by restricting execution to only those operations explicitly defined as safe by the application developers. Running the Devika process with minimal privileges further limits the potential damage of any successful exploitation attempt, adhering to the principle of least privilege essential in secure software design.