CVE-2026-18953

Improper limitation of a pathname to a restricted directory in aws-transform-mcp-server

State: Published
Severity: 6.3 Medium
Published: Aug 5, 2026
Updated: Aug 6, 2026
Reserved: Aug 5, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.3 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H	AMZN
3.1	8.6 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H	AMZN

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected Products

Product	Versions
aws-transform-mcp-serverAWS	0.1.0 through 0.1.4Affected

References

https://pypi.org/project/awslabs.aws-transform-mcp-server/0.1.5/release-notespatch
https://aws.amazon.com/security/security-bulletins/2026-075-aws/vendor-advisory
https://github.com/awslabs/mcp/security/advisories/GHSA-66mr-jr63-2jgwrelease-notes

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