CVE-2026-18953: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in AWS aws-transform-mcp-server
CVE-2026-18953 is a path traversal vulnerability in the get_resource tool of AWS's aws-transform-mcp-server versions 0.1.0 through 0.1.4. This flaw allows an actor with certain context-dependent capabilities to write arbitrary files outside the intended directory via the savePath parameter. The vulnerability has a high severity with a CVSS score of 8.6. AWS has released a fix in version 0.1.5 to address this issue.
AI Analysis
Technical Summary
The vulnerability identified as CVE-2026-18953 involves improper limitation of a pathname to a restricted directory (CWE-22) in the get_resource tool within aws-transform-mcp-server versions 0.1.0 through 0.1.4. Exploitation can lead to arbitrary file writes outside the designated working directory by manipulating the savePath parameter. This could impact confidentiality, integrity, and availability of the system. AWS manages this as a cloud service and has provided an upgrade path to version 0.1.5 or later to remediate the issue.
Potential Impact
Successful exploitation can result in high impact on confidentiality, integrity, and availability due to arbitrary file writes outside the intended directory. This could allow attackers to overwrite critical files or place malicious files, potentially leading to system compromise or denial of service.
Mitigation Recommendations
Users should upgrade aws-transform-mcp-server to version 0.1.5 or later to remediate this vulnerability. Since this is a cloud service managed by AWS, the vendor handles remediation on their side as well. Check the AWS security bulletin at https://aws.amazon.com/security/security-bulletins/2026-075-aws/ for the latest guidance and confirmation of patch status.
CVE-2026-18953: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in AWS aws-transform-mcp-server
Description
CVE-2026-18953 is a path traversal vulnerability in the get_resource tool of AWS's aws-transform-mcp-server versions 0.1.0 through 0.1.4. This flaw allows an actor with certain context-dependent capabilities to write arbitrary files outside the intended directory via the savePath parameter. The vulnerability has a high severity with a CVSS score of 8.6. AWS has released a fix in version 0.1.5 to address this issue.
CVSS v3.1
Score 8.6high
Affected software
pkg:pypi/awslabs-aws-transform-mcp-serverRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability identified as CVE-2026-18953 involves improper limitation of a pathname to a restricted directory (CWE-22) in the get_resource tool within aws-transform-mcp-server versions 0.1.0 through 0.1.4. Exploitation can lead to arbitrary file writes outside the designated working directory by manipulating the savePath parameter. This could impact confidentiality, integrity, and availability of the system. AWS manages this as a cloud service and has provided an upgrade path to version 0.1.5 or later to remediate the issue.
Potential Impact
Successful exploitation can result in high impact on confidentiality, integrity, and availability due to arbitrary file writes outside the intended directory. This could allow attackers to overwrite critical files or place malicious files, potentially leading to system compromise or denial of service.
Mitigation Recommendations
Users should upgrade aws-transform-mcp-server to version 0.1.5 or later to remediate this vulnerability. Since this is a cloud service managed by AWS, the vendor handles remediation on their side as well. Check the AWS security bulletin at https://aws.amazon.com/security/security-bulletins/2026-075-aws/ for the latest guidance and confirmation of patch status.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- AMZN
- Date Reserved
- 2026-08-05T13:44:42.972Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://aws.amazon.com/security/security-bulletins/2026-075-aws/","vendor":"AWS"}]
Threat ID: 6a739210bf8831d5395f9a92
Added to database: 08/05/2026, 19:42:08 UTC
Last enriched: 08/05/2026, 19:56:40 UTC
Last updated: 08/05/2026, 20:21:28 UTC
Views: 5
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