Vulnerability · Published Nov 2, 2026 · Assigned by AMZN

CVE-2026-116635Improper limitation of a pathname to a restricted directory in the deployment status component of the AWS Serverless MCP Server

Medium 6.1

In plain English

A medium-severity security flaw in aws-serverless-mcp-server from AWS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.3%top 75.7% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

Improper limitation of a pathname to a restricted directory in the deployment status component of the AWS Serverless MCP Server (aws-serverless-mcp-server) before v0.2.1 might allow an actor who can influence the MCP agent to read the contents of JSON files outside the intended deployment status directory. Where write access has been enabled, to create or overwrite JSON files outside that directory. This issue is reachable through directory traversal sequences or an absolute path supplied in the project name input. To remediate this issue, users should upgrade to version v0.2.1.

Affected products (as reported)

Vendor	Product	Versions
AWS	aws-serverless-mcp-server	0 – before 0.2.1

Weakness: CWE-23, CWE-36 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

References

https://pypi.org/project/awslabs.aws-serverless-mcp-server/0.2.1/ release-notes, patch
https://aws.amazon.com/security/security-bulletins/2026-164-aws/ vendor-advisory
https://github.com/awslabs/mcp/security/advisories/GHSA-r6mm-377j-qg8m third-party-advisory