CVE-2026-115845

Incomplete validation in the run_script Python sandbox in AWS MCP Server

Published Oct 23, 2026 CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
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.



AWS fixed this issue service-side. No customer action is required.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Aws aws-mcp-server
Vendors & Products Aws aws-mcp-server
Type Values Removed Values Added
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. AWS fixed this issue service-side. No customer action is required.
Title Incomplete validation in the run_script Python sandbox in AWS MCP Server
First Time appeared Aws
Aws aws Mcp Server
Weaknesses CWE-184
CPEs cpe:2.3:a:aws:aws_mcp_server:n_a:*:*:*:*:*:*:*
Vendors & Products Aws
Aws aws Mcp Server
References
Metrics cvssV3_1

{'score': 6.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'}

cvssV4_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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
AMZN
Published
Updated
Nov 2, 2026, 1:46 PM
Reserved
Oct 23, 2026, 5:25 PM
Status
Awaiting Analysis
Published
Oct 23, 2026, 7:17 PM
Modified
Nov 2, 2026, 2:17 PM