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CVE-2026-55581

8.4 Élevée

Publiée le 25/08/2026 à 18:16 · Modifiée le 09/09/2026 à 23:07 · Analyse NVD reportée · Source : security-advisories@github.com

Description

mcp-shell is an MCP server for running shell commands securely, auditably, and on demand. Prior to 0.6.0, the default Docker security.yaml includes /bin/bash in allowed_executables, while security.go validates only the first token and checkBlockedPatternsAndCommands does not reject the shell command-mode flag -c. A caller of the shell_exec MCP tool can provide the command argument `/bin/bash -c <arbitrary-command>`, which passes validation and reaches executor.go, where parseCommand and exec.CommandContext execute the arbitrary command as mcpuser outside the intended allowlist. This issue is fixed in version 0.6.0.

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Produits concernés

Scores CVSS

VersionScoreSourceVecteur
3.1 8.4 Élevée security-advisories@github.com CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Faiblesses (CWE)

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