GPT Researcher Code Injection Vulnerability (CVE-2026-5631)

A code injection vulnerability, identified as CVE-2026-5631, affects assafelovic gpt-researcher up to version 3.4.3. The vulnerability resides in the extract_command_data function within the backend/server/server_utils.py file, specifically in the ws Endpoint component. By manipulating the args argument, a remote attacker can inject and execute arbitrary code on the affected system. Public exploit code is available, increasing the risk of exploitation. The maintainers of the gpt-researcher project have been notified of this vulnerability through an issue report, but have yet to respond. This vulnerability allows for unauthenticated remote code execution, severely impacting the confidentiality, integrity, and availability of the system.

Attack Chain

1. Attacker identifies a vulnerable instance of gpt-researcher running version 3.4.3 or earlier.
2. The attacker crafts a malicious payload designed to exploit the extract_command_data function within backend/server/server_utils.py.
3. The attacker sends a specially crafted request containing the malicious payload to the ws Endpoint via a remote connection.
4. The extract_command_data function processes the attacker-supplied args without proper sanitization or validation.
5. Due to the missing input validation, the malicious payload is interpreted as code.
6. The injected code is executed within the context of the gpt-researcher application, potentially granting the attacker elevated privileges.
7. The attacker establishes a reverse shell to gain persistent access to the server.
8. The attacker compromises sensitive data or pivots to other systems on the network.

Impact

Successful exploitation of CVE-2026-5631 allows a remote, unauthenticated attacker to execute arbitrary code on the server running the vulnerable gpt-researcher instance. The attacker can gain complete control of the affected system, potentially leading to data breaches, service disruption, or further lateral movement within the network. Given that gpt-researcher is often used in research or development environments, the compromise could result in the theft of sensitive intellectual property or research data. The ease of exploitation due to the availability of public exploits increases the likelihood of widespread attacks.

Recommendation

• Upgrade to a patched version of gpt-researcher as soon as one becomes available to remediate CVE-2026-5631.
• Deploy the following Sigma rule to detect potential exploitation attempts targeting the extract_command_data function.
• Monitor network traffic for suspicious requests to the ws Endpoint associated with gpt-researcher to identify potential exploitation attempts.
• Implement input validation and sanitization measures within the extract_command_data function to prevent code injection, as suggested by CVE-2026-5631.