CVE-2026-12957 and CVE-2026-12958 - Issues in Language Servers for AWS and Amazon Q Developer Plugins

Bulletin ID: 2026-047-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 06/23/2026 09:30 AM PDT Description: Language Servers for AWS 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). We identified CVE-2026-12957, an improper trust boundary enforcement issue in Language Servers for AWS before version 1.65.0. If a local user opens a maliciously crafted workspace, any commands within the project configuration files may be automatically executed. This issue requires the user to trust the workspace when prompted. We identified CVE-2026-12958, a missing symlink-validation issue in Language Servers for AWS before version 1.69.0. This may occur when a local user opens a workspace with a maliciously crafted symlink that resolves to a file path outside the workspace trust boundary. These issues affect the Amazon Q Developer IDE plugins, which bundle Language Servers for AWS. Both issues are remediated in Language Servers for AWS version 1.69.0. Affected products & versions: - Language Servers for AWS: < 1.69. - Amazon Q Developer for Visual Studio Code: < 2.20 - Amazon Q Developer for JetBains: < 4.3 - Amazon Q Developer for Eclipse: < 2.7.4 - AWS Toolkit with Amazon Q for Visual Studio: < 1.94.0.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.