low
2.1
CWE
200
EPSS
0.019%
Advisory Published
Advisory Published
Updated

CVE-2025-30222: Shescape has potential environment variable exposure on Windows with CMD

First published: Tue Mar 25 2025(Updated: )

### 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) to upgrade to v2. There is no plan to release a patch compatible with v1 of Shescape. ### Workarounds Alternatively, users can remove all instances of % from user input before using Shescape. ### References - Shescape Pull Request [#1916](https://github.com/ericcornelissen/shescape/pull/1916) - Shescape commit [0a81f1e](https://github.com/ericcornelissen/shescape/commit/0a81f1eb077bab8caae283a2490cd7be9af179c6) - Shescape release [v2.1.2](https://github.com/ericcornelissen/shescape/releases/tag/v2.1.2) ### For more information - Comment on Pull Request [#1916](https://github.com/ericcornelissen/shescape/pull/1916) - Comment on commit [0a81f1e](https://github.com/ericcornelissen/shescape/commit/0a81f1eb077bab8caae283a2490cd7be9af179c6) - Open an issue at [https://github.com/ericcornelissen/shescape/issues](https://github.com/ericcornelissen/shescape/issues) (New issue > Question)

Credit: security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
npm/shescape>=1.7.2<2.1.2
2.1.2
Shescape>=1.7.2<=2.1.1

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2025-30222?

    The severity of CVE-2025-30222 is considered moderate due to potential exposure of environment variables.

  • How do I fix CVE-2025-30222?

    To fix CVE-2025-30222, upgrade Shescape to version 2.1.2 or later.

  • What versions of Shescape are affected by CVE-2025-30222?

    Shescape versions 1.7.2 through 2.1.1 are affected by CVE-2025-30222.

  • Who is impacted by CVE-2025-30222?

    Users of Shescape on Windows who configure the shell as 'cmd.exe' or 'shell: true' are impacted by CVE-2025-30222.

  • What type of vulnerability is CVE-2025-30222?

    CVE-2025-30222 is a vulnerability related to potential environment variable exposure in the Shescape library.

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