What’s Vulnerable › Vulnerabilities

CVE-2026-18953: Improper limitation of a pathname to a restricted directory in aws-transform-mcp-server

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-05 · updated 2026-10-23
• Weakness: CWE-22

Description

Improper limitation of a pathname to a restricted directory in the get_resource tool in Amazon awslabs.aws-transform-mcp-server 0.1.0 through 0.1.4 might allow a context-dependent actor to write arbitrary files outside the intended working directory via the savePath parameter. To remediate this issue, users should upgrade to version 0.1.5 or later.

Affected products

• aws-transform-mcp-server: from 0.1.0 before 0.1.5 — fixed in 0.1.5

How to fix

Upgrade to a fixed version: aws-transform-mcp-server 0.1.5. Check the vendor advisory for mitigations.

References

• https://aws.amazon.com/security/security-bulletins/2026-075-aws/
• https://github.com/awslabs/mcp/security/advisories/GHSA-66mr-jr63-2jgw
• https://pypi.org/project/awslabs.aws-transform-mcp-server/0.1.5/

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