CVE-2026-115845
Incomplete validation in the run_script Python sandbox in AWS MCP Server
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The AWS MCP Server's run_script tool, which runs Python code in a sandbox, is affected. An authenticated remote user could potentially run arbitrary code within their own isolated session, because the code validator does not block all disallowed inputs.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original 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.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- AWS AWS MCP Server
Version range not reported