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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact Low

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
AWS AWS MCP Server unaffected
Version Status Constraints
N/A affected —

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Project Subscriptions

Vendors Products
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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://aws.amazon.com/security/security-bulletins/2026-149-aws/ cve-icon cve-icon
History

Fri, 23 Oct 2026 19:15:00 +0000

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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-10-23T19:04:44.790Z

Reserved: 2026-10-23T17:25:48.577Z

Link: CVE-2026-115845

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-23T19:17:44.643

Modified: 2026-10-23T19:23:01.467

Link: CVE-2026-115845

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T20:30:17Z

Weaknesses