CVE-2026-5059 aws-mcp-server AWS CLI Command Injection Remote Code Execution Vulnerability
Remote attackers can execute arbitrary code on aws-mcp-server installations without authentication due to improper validation of user-supplied strings in command handling.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5059?
CVE-2026-5059 is a critical command injection vulnerability in aws-mcp-server, published on 11 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
aws-mcp-server AWS CLI Command Injection Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of aws-mcp-server. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the handling of the allowed commands list. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of the MCP server. Was ZDI-CAN-27969.
Weakness: CWE-78
Which versions are affected by CVE-2026-5059?
3 open source packages ship an affected version, including aws-mcp.
| Package | Affected | Fixed in |
|---|---|---|
aws-mcp PyPI | All versions to 1.7.0 | None |
aws-mcp PyPI | All versions to 1.7.0 | None |
aws-mcp PyPI | All versions to 1.7.0 | None |
How do I fix CVE-2026-5059?
No fix has been published for CVE-2026-5059 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-5059 being exploited?
There is no known exploitation of CVE-2026-5059 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-fgmx-xfp3-w28p, PYSEC-2026-288.