RCE in Aws-Mcp-Server

CVE-2026-5059

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.

Vulnerability class: Command Injection (OS Command Injection)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.023 (82.8th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 82.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-5059: held from 0.019 to 0.023.

EPSS over last 30 days · oldest: 0.019 · newest: 0.023 · change: +0.004

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-5059?
CVE-2026-5059 is a critical-severity vulnerability in Aws-Mcp-Server, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-04-11.
How severe is CVE-2026-5059?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-5059 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.