evalstate fast-agent up to 0.7.20 Local Shell Executor local_shell_executor.py privileges management

Summaryinfo

A vulnerability, which was classified as critical, has been found in evalstate fast-agent up to 0.7.20. This issue affects some unknown processing of the file tools/local_shell_executor.py of the component Local Shell Executor. This manipulation causes privileges management. The identification of this vulnerability is CVE-2026-102610. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in evalstate fast-agent up to 0.7.20 and classified as critical. Affected by this vulnerability is an unknown functionality of the file tools/local_shell_executor.py of the component Local Shell Executor. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

fast-agent is a framework for building, running, and evaluating AI agents with Model Context Protocol support. Prior to 0.7.21, fast-agent serve uses HTTP transport bound to 0.0.0.0 on port 8000 without authentication, allowing any network client that can reach the /mcp endpoint to invoke the exposed agent tool. When the server is started with --shell, the agent can call the local execute tool implemented by tools/local_shell_executor.py, so an unauthenticated remote client can cause operating-system commands to run as the server user; without --shell, the client can still consume the operator's model and configured MCP tools. The defaults are defined in cli/commands/serve.py and mcp/server/agent_server.py, and the non-interactive server permission prompt does not prevent the described access. This issue is fixed in version 0.7.21.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-102610 since 09/29/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 0.7.21 eliminates this vulnerability.

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Productinfo

Vendor

• evalstate

Name

• fast-agent

Version

• 0.7.0
• 0.7.1
• 0.7.2
• 0.7.3
• 0.7.4
• 0.7.5
• 0.7.6
• 0.7.7
• 0.7.8
• 0.7.9
• 0.7.10
• 0.7.11
• 0.7.12
• 0.7.13
• 0.7.14
• 0.7.15
• 0.7.16
• 0.7.17
• 0.7.18
• 0.7.19
• 0.7.20

Website

• Product: https://github.com/evalstate/fast-agent/

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