Quick answers
- Is CVE-2026-115845 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-115845 being exploited in the wild.
- How severe is CVE-2026-115845?
- High severity, with a CVSS score of 6.4, published 23 October 2026.
- Which products and versions are affected?
- AWS MCP Server.
- Is there a fix for CVE-2026-115845?
- No fixed version is recorded yet. The run_script tool is designed to orchestrate AWS APIs through Python scripts. If used only for legitimate AWS API calls without executing untrusted or user-supplied code, no workaround is required; restrict use of the run_script tool to trusted scripts only. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-115845 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-115845?
- Check whether you run Amazon AWS or AWS MCP Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
The run_script tool is designed to orchestrate AWS APIs through Python scripts. If used only for legitimate AWS API calls without executing untrusted or user-supplied code, no workaround is required; restrict use of the run_script tool to trusted scripts only.
Technical details
The run_script tool in AWS MCP Server uses a Python code validator to block dangerous operations in a sandboxed environment. An incomplete blocklist of disallowed inputs allows an authenticated remote attacker to craft malicious Python scripts that bypass the sandbox restrictions and execute arbitrary code within their isolated session environment.
Affected products
- AWS MCP Server
Timeline
- 2026-10-23: disclosed