{"id":"GHSA-j7h9-2jh7-g967","aliases":[],"status":"published","title":"mcp-ssh-tool has file transfer path policy bypass and bearer token comparison hardening","description":"## Summary\n\n`mcp-ssh-tool` has released version `2.1.1` with security hardening for transfer path authorization and HTTP bearer authentication.\n\nThe release addresses:\n\n- insufficient local path policy enforcement in transfer-related filesystem handling\n- incomplete canonicalization and segment-boundary handling for deny-prefix path policy checks\n- non-constant-time HTTP bearer token comparison\n\n## Impact\n\nAffected versions may allow policy bypass in transfer path handling under specific configurations, and may expose a timing side channel in bearer-token comparison for HTTP deployments.\n\n## Patched Version\n\nUpgrade to `mcp-ssh-tool \u003e= 2.1.1`.\n\n```bash\nnpm install -g mcp-ssh-tool@latest\n```\n\n## Workarounds\n\nFor deployments that cannot immediately upgrade:\n\n- avoid exposing HTTP transport beyond loopback\n- use strict filesystem policy configuration\n- avoid granting MCP clients access to sensitive local transfer paths\n- monitor audit logs for unexpected transfer operations\n\n## Credits\n\nReported by `dodge1218`.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high","from":"ghsa"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-208","CWE-22"],"published":"2026-05-07T21:45:16Z","modified":"2026-08-16T11:43:20Z","fixes":[{"ecosystem":"npm","package":"mcp-ssh-tool","fixed_in":["2.1.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"mcp-ssh-tool","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.1.0"},{"fixed":"2.1.1"}]}]},{"source":"osv","ecosystem":"npm","package":"mcp-ssh-tool","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.1.1"}]}]}],"references":[{"url":"https://github.com/oaslananka/mcp-ssh-tool/security/advisories/GHSA-j7h9-2jh7-g967","tags":["web"]},{"url":"https://github.com/advisories/GHSA-j7h9-2jh7-g967"},{"url":"https://github.com/oaslananka/mcp-ssh-tool","tags":["package"]}],"sources":{"ghsa":[{"id":"GHSA-j7h9-2jh7-g967","title":"mcp-ssh-tool has file transfer path policy bypass and bearer token comparison hardening","description":"## Summary\n\n`mcp-ssh-tool` has released version `2.1.1` with security hardening for transfer path authorization and HTTP bearer authentication.\n\nThe release addresses:\n\n- insufficient local path policy enforcement in transfer-related filesystem handling\n- incomplete canonicalization and segment-boundary handling for deny-prefix path policy checks\n- non-constant-time HTTP bearer token comparison\n\n## Impact\n\nAffected versions may allow policy bypass in transfer path handling under specific configurations, and may expose a timing side channel in bearer-token comparison for HTTP deployments.\n\n## Patched Version\n\nUpgrade to `mcp-ssh-tool \u003e= 2.1.1`.\n\n```bash\nnpm install -g mcp-ssh-tool@latest\n```\n\n## Workarounds\n\nFor deployments that cannot immediately upgrade:\n\n- avoid exposing HTTP transport beyond loopback\n- use strict filesystem policy configuration\n- avoid granting MCP clients access to sensitive local transfer paths\n- monitor audit logs for unexpected transfer operations\n\n## Credits\n\nReported by `dodge1218`.","status":"published","published":"2026-05-07T21:45:16Z","modified":"2026-08-16T11:43:20Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-22","CWE-208"],"updated_at":"2026-11-02T14:41:01.23108Z"}],"osv":[{"id":"GHSA-j7h9-2jh7-g967","title":"mcp-ssh-tool has file transfer path policy bypass and bearer token comparison hardening","description":"## Summary\n\n`mcp-ssh-tool` has released version `2.1.1` with security hardening for transfer path authorization and HTTP bearer authentication.\n\nThe release addresses:\n\n- insufficient local path policy enforcement in transfer-related filesystem handling\n- incomplete canonicalization and segment-boundary handling for deny-prefix path policy checks\n- non-constant-time HTTP bearer token comparison\n\n## Impact\n\nAffected versions may allow policy bypass in transfer path handling under specific configurations, and may expose a timing side channel in bearer-token comparison for HTTP deployments.\n\n## Patched Version\n\nUpgrade to `mcp-ssh-tool \u003e= 2.1.1`.\n\n```bash\nnpm install -g mcp-ssh-tool@latest\n```\n\n## Workarounds\n\nFor deployments that cannot immediately upgrade:\n\n- avoid exposing HTTP transport beyond loopback\n- use strict filesystem policy configuration\n- avoid granting MCP clients access to sensitive local transfer paths\n- monitor audit logs for unexpected transfer operations\n\n## Credits\n\nReported by `dodge1218`.","status":"published","published":"2026-05-07T21:45:16Z","modified":"2026-05-21T05:15:08.446595569Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-208","CWE-22"],"updated_at":"2026-11-02T15:46:49.977351Z"}]}}