Sonirico mcp-shell up to 0.5.x Shell Execution security.go shell_exec command os command injection

Summaryinfo

A vulnerability categorized as critical has been discovered in Sonirico mcp-shell up to 0.5.x. The impacted element is the function shell_exec of the file security.go of the component Shell Execution. Executing a manipulation of the argument command can lead to os command injection. This vulnerability is handled as CVE-2026-55582. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Sonirico mcp-shell up to 0.5.x. It has been declared as critical. This vulnerability affects the function shell_exec of the file security.go of the component Shell Execution. The manipulation of the argument command with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

mcp-shell is an MCP server for running shell commands securely, auditably, and on demand. Prior to 0.6.0, the default security.yaml allows /usr/bin/git, while security.go omits ! from containsShellMetacharacters and containsDangerousShellConstructs and applies no per-executable argument policy. A caller of the shell_exec MCP tool can provide the command argument /usr/bin/git -c alias.pwn=!<arbitrary-command>, causing Git to create a shell alias and execute arbitrary OS commands as the mcp-shell process user. The default Docker image runs as mcpuser with Git installed and secure mode enabled, so the bypass is exploitable in the default deployment without additional authentication beyond MCP connectivity. This issue is fixed in version 0.6.0.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-55582 since 06/17/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1202.

Upgrading to version 0.6.0 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• Sonirico

Name

• mcp-shell

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5

Website

• Product: https://github.com/sonirico/mcp-shell/

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