---
id: CVE-2026-12957
aliases:
  - GHSA-xhcr-j4j9-3gh7
title: Language Servers for AWS Vulnerable to Arbitrary Code Execution
summary: Language Servers for AWS Vulnerable to Arbitrary Code Execution
severity: high
cwe:
  - CWE-732
vendor: aws
product: '@aws/lsp-codewhisperer'
ecosystem: npm
affected:
  - '@aws/lsp-codewhisperer < 0.0.113'
patched:
  - '@aws/lsp-codewhisperer 0.0.113'
published: '2026-09-24'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T19:13:54Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-xhcr-j4j9-3gh7'
references:
  - url: >-
      https://github.com/aws/language-servers/security/advisories/GHSA-xhcr-j4j9-3gh7
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-12957'
  - url: 'https://github.com/Amazon-Q-Developer/language-servers/pull/2708'
  - url: 'https://github.com/Amazon-Q-Developer/language-servers/pull/2711'
  - url: >-
      https://github.com/Amazon-Q-Developer/language-servers/commit/7b8595a4e638562f79d5f71dcf22b0c700490458
  - url: >-
      https://github.com/Amazon-Q-Developer/language-servers/commit/f5aa1a3b25aa38bfe8dd0e830b5839e1cea1d410
  - url: 'https://aws.amazon.com/security/security-bulletins/2026-047-aws'
  - url: >-
      https://github.com/Amazon-Q-Developer/language-servers/releases/tag/agentic-rc-1.65.0
  - url: 'https://github.com/advisories/GHSA-xhcr-j4j9-3gh7'
tags:
  - ghsa
  - npm
epss: 0.00178
epssPercentile: 0.06474
ingestedAt: '2026-09-24T19:50:30.723Z'
---

## Overview

### Summary
Language Servers for AWS (the aws/language-servers project) provide the underlying language-server runtime that powers Amazon Q Developer's AI coding assistance across its IDE plugins (Visual Studio Code, JetBrains, Eclipse, and
Visual Studio).

Improper trust boundary enforcement in Language Servers for AWS may allow for arbitrary code execution. If a local user opens a maliciously crafted workspace, any commands within the project configuration files may be automatically
executed.

### Impact

When a local user opens a maliciously crafted workspace and trusts it when prompted, commands defined in the workspace's project-level configuration files may be executed automatically, resulting in arbitrary code execution on the
user's host.

This issue is triggered when a user opens a workspace, trusts it, and the agent subsequently executes commands defined in the project-level configuration files.


Impacted versions: Language Servers for AWS version <1.65.0.

### Patches
This issue has been addressed in Language Servers for AWS version 1.65.0. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes. 

### Workarounds
No workarounds are available.

### References
If you have any questions or comments about this advisory, AWS Security asks that you contact them via their [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting) or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com). Please do not create a public GitHub issue.

### Acknowledgement 

AWS Security would like to thank Wiz and Maor Dokhanian for collaborating on this issue through the coordinated vulnerability disclosure process.

## Affected packages

- `@aws/lsp-codewhisperer < 0.0.113`

## Remediation

Upgrade to a patched release:

- `@aws/lsp-codewhisperer 0.0.113`