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Vulnerabilities

Vulnerability · CVE-2026-115845

Incomplete validation in the run_script Python sandbox in AWS MCP Server

Published Oct 23, 2026 · catalog updated Oct 23, 2026 · Amazon Web Services AWS MCP Server

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-115845. EPSS is 0.31%. Act only if a listed version of Amazon Web Services AWS MCP Server is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.31%
Remediation
Advisory link
Affected products
vendor AWS AWS MCP Server

Bulletin ID: 2026-149-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 10/23/2026 12:00 PM PDT Description: AWS MCP Server is a managed server that gives AI agents access to AWS through the Model Context Protocol (MCP), including a run_script tool that runs Python scripts in a sandboxed environment. We identified CVE-2026-115845, an issue in the Python code validator of the run_script tool in AWS MCP Server. An incomplete list of disallowed inputs might allow an authenticated remote user to exec

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor AWS AWS MCP Serverversion unspecified

How to fix CVE-2026-115845

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-115845. EPSS is 0.31%. Act only if a listed version of Amazon Web Services AWS MCP Server is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-184. EPSS 0.31%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 23, 2026 · CIRCL Vulnerability Lookup

    Detected

    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.

Sources

  • AWS Security BulletinsVendor advisoryCVE-2026-115845

    Read this article

    aws.amazon.com
  • CIRCL Vulnerability LookupVulnerability recordCVE-2026-115845

    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.

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2026-115845

    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.

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-115845

    30-day exploitation probability 0.31%

    first.org

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 6, 2026
  • AWS Security BulletinsNov 6, 2026
  • CVE.orgOct 24, 2026
  • CIRCL Vulnerability LookupOct 23, 2026