CVE-2026-49241
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
The Angular Language Service VS Code extension before version 21.2.4 reads the custom TypeScript SDK path from .vscode/settings.json without verifying Workspace Trust. It then passes this path as an argument to the language server process, which dynamically imports the tsserverlibrary.js library from the attacker-specified location. This allows arbitrary code execution when a developer opens a crafted repository.
Risk Assessment
An attacker can take control of the victim's development environment by executing arbitrary JavaScript code in the context of the language server process, leading to data theft, backdoor installation, or further system compromise.
Recommendation
Immediately update the Angular Language Service extension to version 21.2.4 or later. Additionally, consider enabling Workspace Trust in VS Code and avoid opening untrusted repositories without prior verification.
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Original NVD description (English source)
The Angular Language Service VS Code Extension provides a rich editing experience for Angular templates. Prior to 21.2.4, the client-side Angular Language Service VS Code extension reads the custom TypeScript SDK paths typescript.tsdk and js/ts.tsdk.path directly from workspace configurations (.vscode/settings.json) without verifying VS Code Workspace Trust state or asking for user consent (located in client/src/client.ts). The client-side extension then passes the parsed settings path as a command-line argument (--tsdk) to the background Node.js language server process. During server initialization, the background language server resolves and dynamically imports (via standard Node.js require()) the module library tsserverlibrary.js relative to the workspace-specified custom directory path. An attacker can exploit this behavior by committing a repository containing a local malicious tsserverlibrary.js script inside a custom folder, and a crafted .vscode/settings.json file pointing to that folder. When a developer opens the repository folder in VS Code, the extension automatically attempts to initialize and load the server, which dynamically resolves, loads, and executes the malicious script silently in the background. This vulnerability is fixed in 21.2.4.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS