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

Status: published. Published: 2026-11-02. Updated: 2026-11-02.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: AMZN) — https://pypi.org/project/awslabs.aws-serverless-mcp-server/0.2.1/

## Affected products and versions

- AWS / aws-serverless-mcp-server: ≥ 0; < 0.2.1 (affected, custom). Source: CNA: AMZN

## Severity and prioritization

- CVSS 3.1: 6.1 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N; source: CNA: AMZN

- CVSS 4.0: 6.9 (medium); CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N; source: CNA: AMZN

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-23, CWE-36

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://pypi.org/project/awslabs.aws-serverless-mcp-server/0.2.1/ (CNA: AMZN; release-notes, patch)

- https://aws.amazon.com/security/security-bulletins/2026-164-aws/ (CNA: AMZN; vendor-advisory)

- https://github.com/awslabs/mcp/security/advisories/GHSA-r6mm-377j-qg8m (CNA: AMZN; third-party-advisory)

## Provenance

- CNA: AMZN: https://www.cve.org/CVERecord?id=CVE-2026-116635; retrieved 2026-11-02; source updated 2026-11-02

Revision: 76030a94baae18996e38141b10f6aeb33e79ae41dfd8d19851fedd606256bd2e

Canonical: https://y2.dev/cve/CVE-2026-116635

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