{"id":"CVE-2026-115845","aliases":["EUVD-2026-109127","GHSA-jmwp-36mq-x645"],"status":"published","title":"Incomplete validation in the run_script Python sandbox in AWS MCP Server","description":"An incomplete list of disallowed inputs in the Python code validator of the run_script tool in AWS MCP Server might allow an authenticated remote user to execute arbitrary code within their own isolated session environment via a crafted script.\n\n\n\nAWS fixed this issue service-side. No customer action is required.","severity":{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00306,"percentile":0.23688,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-184"],"published":"2026-10-23T19:04:44Z","modified":"2026-11-02T14:17:36Z","products":[{"vendor":"aws","product":"aws mcp server"}],"references":[{"url":"https://aws.amazon.com/security/security-bulletins/2026-149-aws/","tags":["vendor-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115845"},{"url":"https://aws.amazon.com/security/security-bulletins/2026-149-aws"},{"url":"https://github.com/advisories/GHSA-jmwp-36mq-x645"}],"sources":{"cve":[{"id":"CVE-2026-115845","title":"Incomplete validation in the run_script Python sandbox in AWS MCP Server","description":"An incomplete list of disallowed inputs in the Python code validator of the run_script tool in AWS MCP Server might allow an authenticated remote user to execute arbitrary code within their own isolated session environment via a crafted script.\n\n\n\nAWS fixed this issue service-side. No customer action is required.","status":"published","published":"2026-10-23T19:04:44.79Z","modified":"2026-11-02T13:46:34.164Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","level":"medium","assessor":"cna"},{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-184"],"updated_at":"2026-11-02T18:00:08.034842Z"}],"euvd":[{"id":"EUVD-2026-109127","description":"An incomplete list of disallowed inputs in the Python code validator of the run_script tool in AWS MCP Server might allow an authenticated remote user to execute arbitrary code within their own isolated session environment via a crafted script.\n\n\n\nAWS fixed this issue service-side. No customer action is required.","status":"published","published":"2026-10-23T19:04:44Z","modified":"2026-11-02T13:46:34Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","level":"medium"}],"updated_at":"2026-11-02T16:58:45.261111Z"}],"ghsa":[{"id":"GHSA-jmwp-36mq-x645","title":"An incomplete list of disallowed inputs in the Python code validator of the run_script tool in...","description":"An incomplete list of disallowed inputs in the Python code validator of the run_script tool in AWS MCP Server might allow an authenticated remote user to execute arbitrary code within their own isolated session environment via a crafted script.\n\n\n\nAWS fixed this issue service-side. No customer action is required.","status":"published","published":"2026-10-23T21:36:05Z","modified":"2026-10-23T21:36:10Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"},{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-184"],"updated_at":"2026-11-02T15:14:20.706608Z"}],"nvd":[{"id":"CVE-2026-115845","description":"An incomplete list of disallowed inputs in the Python code validator of the run_script tool in AWS MCP Server might allow an authenticated remote user to execute arbitrary code within their own isolated session environment via a crafted script.\n\n\n\nAWS fixed this issue service-side. No customer action is required.","status":"published","published":"2026-10-23T19:17:44.643Z","modified":"2026-11-02T14:17:36.447Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-184"],"updated_at":"2026-11-02T20:51:42.579129Z"}]}}