PatchTheCEVCVE-2026-115845: An incomplete list of disallowed inputs in the Python code validator of the run_script tool in AWS MCP Server
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Routine
MEDIUM 6.4WATCHLIST
CVE-2026-115845 is a medium-severity flaw (CVSS 6.4) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- On your watchlist
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 6.4 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | n/a |
| CISA exploited list | No |
| Weakness | CWE-184 |
| Published | 2026-10-23 |
| Last modified | 2026-10-23 |
Publisher (CNA): AMZN
Timeline
- Published CVE record published
- Updated Record last modified
Advisories and coverage
Official advisories
- AWS Security Bulletins: CVE-2026-115845 - Incomplete validation in the run_script Python sandbox in AWS MCP Server 2026-10-23
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.