{"answers":{"affected":"3 open source packages ship an affected version, including github.com/sonirico/mcp-shell.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55580 exists.","fix":"Upgrade github.com/sonirico/mcp-shell to 0.6.0 or later.","what":"CVE-2026-55580 is a high-severity command injection vulnerability in sonirico mcp-shell, published on 25 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-55580 and fix it if it is affected.\n\nWhat it is: CVE-2026-55580 is a high-severity command injection vulnerability in sonirico mcp-shell, published on 25 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55580 exists.\n\nAffected packages and fixed versions:\n- github.com/sonirico/mcp-shell (Go): affected all versions; fixed in 0.6.0\n- github.com/sonirico/mcp-shell (Go): affected all versions; fixed in 0.6.0\n- github.com/sonirico/mcp-shell (Go): affected all versions; fixed in 0.6.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-55580/ (Markdown: https://insights.sbomify.com/CVE-2026-55580/index.md)","id":"CVE-2026-55580","markdown":"https://insights.sbomify.com/CVE-2026-55580/index.md","name":"CVE-2026-55580","record":{"aliases":["GHSA-f5pj-2738-996m","GO-2026-6292"],"analysis":{"component_type":"developer_tool","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"MCP shell server","requires_auth":"none","summary":"An attacker can execute arbitrary OS commands via the shell_exec tool because security validation is disabled by default in the bare-binary deployment path.","user_interaction":"not_required","vuln_class":"command_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":8.6,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-78","name":"Improper Neutralization of Special Elements used in an OS Command"}],"description":"mcp-shell is an MCP server for running shell commands securely, auditably, and on demand. Prior to 0.6.0, config.go initializes Security.Enabled to false, and when MCP_SHELL_SEC_CONFIG_FILE is unset, main.go starts the documented bare-binary deployment without a security policy. SecurityValidator.validateCommand in security.go then short-circuits and allows every command supplied to the shell_exec MCP tool, so an LLM connected over stdio can execute unrestricted OS commands as the mcp-shell process user. The README from-source installation and MCP client configuration omit MCP_SHELL_SEC_CONFIG_FILE, making the insecure state the documented default. This issue is fixed in version 0.6.0.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"mcp-shell — Security Disabled by Default in Bare-Binary Deploy Path + Shell Interpreter in Secure-Mode Allowlist","id":"CVE-2026-55580","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"command_injection","year":"2026"},"n_packages":3,"n_references":4,"next":{"headline":"mcp-shell: Secure Mode Allowlist Bypass via Default `/bin/bash` Executable","id":"CVE-2026-55581"},"packages":[{"ecosystem":"Go","fixed":["0.6.0"],"introduced":["0"],"last_affected":[],"package":"github.com/sonirico/mcp-shell","purl":null,"source":"GHSA-f5pj-2738-996m"},{"ecosystem":"Go","fixed":["0.6.0"],"introduced":["0"],"last_affected":[],"package":"github.com/sonirico/mcp-shell","purl":"pkg:golang/github.com/sonirico/mcp-shell","source":"GHSA-f5pj-2738-996m"},{"ecosystem":"Go","fixed":["0.6.0"],"introduced":["0"],"last_affected":[],"package":"github.com/sonirico/mcp-shell","purl":"pkg:golang/github.com/sonirico/mcp-shell","source":"GO-2026-6292"}],"prev":{"headline":"Pheditor: Hardcoded default password 'admin' with no forced change enables full application compromise","id":"CVE-2026-55579"},"products":["mcp-shell"],"published":"2026-08-25","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-08-25","vendors":["sonirico"]},"summary":"An attacker can execute arbitrary OS commands via the shell_exec tool because security validation is disabled by default in the bare-binary deployment path.","url":"https://insights.sbomify.com/CVE-2026-55580/"}