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

> CVE-2026-18953: Improper limitation of a pathname to a restricted directory in aws-transform-mcp-server. CVSS 8.6 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-18953
Last updated: 2026-10-23T21:10:00Z

- Published: 2026-08-05 19:33 UTC · Updated: 2026-10-23 21:10 UTC · Assigner: AMZN
- CVSS: 8.6 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- EPSS: 0.18%, 8th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: 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 vendors and products

- AWS: aws-transform-mcp-server

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-18953)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-18953)
- [https://aws.amazon.com/security/security-bulletins/2026-075-aws/](https://aws.amazon.com/security/security-bulletins/2026-075-aws/)
- [https://github.com/awslabs/mcp/security/advisories/GHSA-66mr-jr63-2jgw](https://github.com/awslabs/mcp/security/advisories/GHSA-66mr-jr63-2jgw)
- [https://pypi.org/project/awslabs.aws-transform-mcp-server/0.1.5/](https://pypi.org/project/awslabs.aws-transform-mcp-server/0.1.5/)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-18953 · Markdown: https://rewindex.com/cve/CVE-2026-18953.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-18953 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:11:29.727Z