{"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-2026-55582 exists.","fix":"Upgrade github.com/sonirico/mcp-shell to 0.6.0 or later.","what":"CVE-2026-55582 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-2026-55582 and fix it if it is affected.\n\nWhat it is: CVE-2026-55582 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-2026-55582 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-2026-55582/ (Markdown: https://insights.sbomify.com/CVE-2026-55582/index.md)","id":"CVE-2026-55582","markdown":"https://insights.sbomify.com/CVE-2026-55582/index.md","name":"CVE-2026-55582","record":{"aliases":["GHSA-74hp-mggr-hv58","GO-2026-6291"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"MCP shell server","requires_auth":"none","summary":"Attackers can execute arbitrary OS commands via Git shell aliases in mcp-shell, bypassing secure mode allowlists in default deployments.","user_interaction":"not_required","vuln_class":"command_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":8.4,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"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, 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=!\u003carbitrary-command\u003e, 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.","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: Secure Mode Allowlist Bypass via Git Shell Alias","id":"CVE-2026-55582","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":"Twenty: Cross-workspace IDOR in AgentTurnResolver","id":"CVE-2026-55583"},"packages":[{"ecosystem":"Go","fixed":["0.6.0"],"introduced":["0"],"last_affected":[],"package":"github.com/sonirico/mcp-shell","purl":null,"source":"GHSA-74hp-mggr-hv58"},{"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-74hp-mggr-hv58"},{"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-2026-6291"}],"prev":{"headline":"mcp-shell: Secure Mode Allowlist Bypass via Default `/bin/bash` Executable","id":"CVE-2026-55581"},"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":"2026-08-28","vendors":["sonirico"]},"summary":"Attackers can execute arbitrary OS commands via Git shell aliases in mcp-shell, bypassing secure mode allowlists in default deployments.","url":"https://insights.sbomify.com/CVE-2026-55582/"}