Improper Protection of Alternate Path exists in the no-access and workdir feature of the AWS API MCP Server versions >= 0.2.14 and < 1.3.9 on all platforms may allow the bypass of intended file access
Improper Protection of Alternate Path exists in the no-access and workdir feature of the AWS API MCP Server versions >= 0.2.14 and < 1.3.9 on all platforms may allow the bypass of intended file access restriction and expose arbitrary local file contents in the MCP client application context.
To remediate this issue, users should upgrade to version 1.3.9.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | awslabs-aws-api-mcp-server | >= 0.2.14, < 1.3.9 | 1.3.9 |
References
- https://github.com/awslabs/mcp/security/advisories/GHSA-2cpp-j2fc-qhp7
- https://nvd.nist.gov/vuln/detail/CVE-2026-4270
- https://aws.amazon.com/security/security-bulletins/2026-007-AWS
- https://github.com/awslabs/mcp
- https://github.com/pypa/advisory-database/tree/main/vulns/awslabs-aws-api-mcp-server/PYSEC-2026-162.yaml
- https://pypi.org/project/awslabs.aws-api-mcp-server/1.3.9
- https://aws.amazon.com/security/security-bulletins/2026-007-AWS/
- https://pypi.org/project/awslabs.aws-api-mcp-server/1.3.9/
- https://github.com/advisories/GHSA-2cpp-j2fc-qhp7
- CVSS vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X- Weakness (CWE)
CWE-424- Platform
- Python (PyPI)
- Package
awslabs-aws-api-mcp-server- Disclosed
- 16.03.2026
- Updated
- 11.10.2026 12:19
Sources and licenses
OSV / GitHub Advisory Database - GHSA-2cpp-j2fc-qhp7 - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-162 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: awslabs-aws-api-mcp-server
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 03.2026 07.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 1
Disclosures per year
- 2026: 2
-
Improper Protection of Alternate Path exists in the no-access and workdir feature of the AWS API MCP Server versions >= 0.2.14 and < 1.3.9 on all platforms may allow the bypass of intended file access this entry
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