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?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

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)

EPSS: 0.019 (77.6th percentile) — read the EPSS interpretation.

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.

Affected products

Aws-mcp-server — versions 1.3.0

Weakness classification (CWE)

CWE-78 — OS Command Injection

Public proof-of-concept exploits

venom203020/CVE-2026-5059-poc

References

zdi-disclosures@trendmicro.com (x_research-advisory)

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?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.