# 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.

- **Severity:** Critical 9.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Apr 2026
- **Updated:** 13 Apr 2026
- **Also known as:** GHSA-fgmx-xfp3-w28p, PYSEC-2026-288

## 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 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2026-5059?

3 open source packages ship an affected version, including aws-mcp.


| Package | Ecosystem | 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.

## 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:

- poc CVE-2026-5059 in aws-mcp-server (github_poc): https://github.com/pwn0x000/CVE-2026-5059-poc

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5059 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-5059 in the wild and no public exploit code.

Affected packages and fixed versions:
- aws-mcp (PyPI): affected all versions up to 1.7.0; no fix listed
- aws-mcp (PyPI): affected all versions up to 1.7.0; no fix listed
- aws-mcp (PyPI): affected all versions up to 1.7.0; no fix listed

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-5059/ (Markdown: https://insights.sbomify.com/CVE-2026-5059/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5059
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5059
- OSV: https://osv.dev/vulnerability/CVE-2026-5059

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-5059/
Summaries are generated and may contain mistakes; the official description above is the record.