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EUVD-2026-225161

2026-10-12T23:12:24.292342+00:00

EUVD-2026-225161

fkie_cve-2025-30222

2026-10-12T23:12:24.292375+00:00

Shescape is a simple shell escape library for JavaScript. Versions 1.7.2 through 2.1.1 are vulnerable to potential environment variable exposure on Windows with CMD. This impact users of Shescape on Windows that explicitly configure `shell: 'cmd.exe'` or `shell: true` using any of `quote`/`quoteAll`/`escape`/`escapeAll`. An attacker may be able to get read-only access to environment variables. This bug has been patched in v2.1.2. For those who are already using v2 of Shescape, no further changes are required. Those who are are using v1 of Shescape should follow the migration guide to upgrade to v2. There is no plan to release a patch compatible with v1 of Shescape. As a workaround, users can remove all instances of `%` from user input before using Shescape.

GHSA-66pp-5p9w-q87j — Shescape has potential environment variable exposure on Windows with CMD

2026-10-12T23:12:24.292411+00:00

Affected: npm: shescape

### Impact

This impact users of Shescape on Windows that explicitly configure `shell: 'cmd.exe'` or `shell: true` using any of `quote`/`quoteAll`/`escape`/`escapeAll`.

An attacker may be able to get read-only access to environment variables. Example:

```javascript import * as cp from "node:child_process"; import { Shescape } from "shescape";

// 1. Prerequisites const shescape = new Shescape({ shell: "cmd.exe", // Or shell: true, // Only if the default shell is CMD });

// 2. Payload const payload = '"%PATH%';

// 3. Usage let escapedPayload;

escapedPayload = shescape.quote(payload); // Or escapedPayload = shescape.quoteAll([payload]); // Or escapedPayload = shescape.escape(payload); // Or escapedPayload = shescape.escapeAll([payload]);

// And (example) const result = cp.execSync(`echo Hello ${escapedPayload}`, options);

// 4. Impact console.log(result.toString()); // Outputs "Hello" followed by the contents of the PATH environment variable ```

For Shescape prior to v2.0.0, the `options` object must have `shell: 'cmd.exe'` or `shell: undefined` and `interpolation: true`.

### Patches

This bug has been patched in [v2.1.2](https://github.com/ericcornelissen/shescape/releases/tag/v2.1.2) which you can upgrade to now.

If you are already using v2 of Shescape, no further changes are required. If you are using v1 of Shescape, follow the [migration guide](https://github.com/ericcornelissen/shescape/blob/155b13b4141750203ce71249f1b0fdc638c7a0d0/docs/migration.md…