High severity · published Aug 5, 2026
CVE-2026-18953
Improper limitation of a pathname to a restricted directory in aws-transform-mcp-server
8.8
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AW
aws-transform-mcp-server · AWS
0.1.0 through 0.1.4 · source: vendor
AT
Aws Transform Mcp Server · Amazon
0.1.0 before 0.1.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18953
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18953
Vendor Advisory
https://aws.amazon.com/security/security-bulletins/2026-075-aws/
Vendor Advisory
https://github.com/awslabs/mcp/security/advisories/GHSA-66mr-jr63-2jgw
Product
https://pypi.org/project/awslabs.aws-transform-mcp-server/0.1.5/