2.1

CVSS Score

4.0

-

CVSS Score

Basic Information

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CVE-2025-30222

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

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:

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 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 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
Shescape commit 0a81f1e
Shescape release v2.1.2

For more information

Comment on Pull Request #1916
Comment on commit 0a81f1e
Open an issue at https://github.com/ericcornelissen/shescape/issues (New issue > Question)

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-30222

CVE-2025-30222:

2.1

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
shescape	npm

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from improper escaping logic in the Windows CMD argument handler. The commit diff shows a fundamental rewrite of the escapeArg function - it replaced a stateful quote-count-dependent escaping mechanism with a uniform pattern that escapes special characters regardless of quote context. The tests demonstrate that before the fix, inputs like '"%PATH%' would not escape the '%' characters when quotes were present, while after the fix they receive the required '^' escapes. This matches the vulnerability description where unescaped '%' characters in CMD context lead to environment variable exposure.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

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WAF Protection Rules

WAF Rule

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Reasoning

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2.1

-

Basic Information

Basic Information

Concerned about an active attack path?

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

Impact

Patches

Workarounds

References

For more information

CVE-2025-30222:

2.1

-

Basic Information

Basic Information

Is this CVE running in your environment?

Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

Vulnerability IntelligenceMiggo AI

Unlock WAF rules for this CVE

WAF Protection Rules

WAF Rule

Reasoning

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

2.1

2.1

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

Impact

Patches

Workarounds

References

For more information

Basic Information

Basic Information

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI