CVE-2026-55582High· 8.4▾ Twilightmcp-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 containsDangerousShel…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 46.2 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 26.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.2%
Last analysed / modified upstream
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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
github.com/sonirico/mcp-shell < 0.6.0Patched in:
github.com/sonirico/mcp-shell 0.6.0Connected by shared product, vendor, weakness, or advisory.
CVE-2026-55581High· 8.4mcp-shell is an MCP server for running shell commands securely, auditably, and on demand
CVE-2026-55580Highmcp-shell is an MCP server for running shell commands securely, auditably, and on demand
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