Arbitrary Code Execution in @rspack/plugin-react-refresh prior to 1.6.0 via overlay.entry Manipulation

Start by reviewing package/package/dist/sockets/WDSSocket.js line 51 and the related getSocketUrlParts path, then compare them with the two provided PoCs. Reproduce the reported overlay.entry flows and determine whether the claimed code-execution behavior is demonstrated; done means a confirmed, reproducible finding with a defined remediation scope.

hi, we are a security team. We found a vulnerability in your project.

Vulnerability Report: @rspack/plugin-react-refresh

Package Information

Field	Value
Package Name	@rspack/plugin-react-refresh
Version	1.6.0
Vulnerability Type	Arbitrary Code Execution

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Vulnerability Details

EX0001: Code Execution

Verified Output: [CASE_ID=EX0001] [VULN_CMD] overlay.entry taint triggered error with marker

Taint Analysis:

The overlay.entry option flows through plugin configuration into WDSSocket.js initialization. When the socket connection is established, the entry path is used to construct the WebSocket client. The connection.onMessage handler at line 51 processes incoming data with JSON.parse, which could trigger code execution if the entry path influences the socket URL construction or message handling logic. The attacker-controlled entry string could be crafted to manipulate the WebSocket connection initialization.

Sink Location: package/package/dist/sockets/WDSSocket.js line 51

PoC Code:

const _pkg = await import(require.resolve('./package/package'));
const ReactRefreshPlugin = _pkg.default;
const plugin = new ReactRefreshPlugin({ overlay: { entry: 'TAINT_MARKER_ENTRY', sockIntegration: 'wds' } });
const mockCompiler = { hooks: { compilation: { tap: () => {} }, done: { tap: () => {} } }, options: { devServer: { hot: true } } };
plugin.apply(mockCompiler);

PoC File: poc_EX0001.js

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EX0004: Code Execution

Verified Output: [CASE_ID=EX0004] [VULN_CMD] overlay.entry query taint triggered error with marker

Taint Analysis:

The overlay.entry option with query parameters flows into the WDSSocket initialization. The resourceQuery parameter is processed by getSocketUrlParts (line 49) to construct the WebSocket URL. This query string influences the connection object creation (line 50) and the subsequent onMessage handler setup (line 51). If the query parameters are not properly sanitized, they could manipulate the message handling logic where JSON.parse is called on incoming data, potentially leading to prototype pollution or code execution through crafted WebSocket messages.

Sink Location: package/package/dist/sockets/WDSSocket.js line 51

PoC Code:

const _pkg = await import(require.resolve('./package/package'));
const ReactRefreshPlugin = _pkg.default;
const plugin = new ReactRefreshPlugin({ overlay: { entry: 'webpack-dev-server/client?TAINT_MARKER_QUERY', sockIntegration: 'wds' } });
const mockCompiler = { hooks: { compilation: { tap: () => {} }, done: { tap: () => {} } }, options: { devServer: { hot: true } } };
plugin.apply(mockCompiler);

PoC File: poc_EX0004.js

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Affected Sinks

File	Line	Type	Code Snippet
package/package/dist/index.js	14	NO_HASOWN	for(var key in definition)if (__webpack_require__.o(definition, key) && !__webpack_require__.o(exports1, key)) Object.defineProperty(exports1, key, {
package/package/dist/index.js	248	DYNAMIC_PROP_WRITE	exports["default"] = __webpack_exports__["default"];
package/package/dist/index.js	249	NO_HASOWN	for(var __webpack_i__ in __webpack_exports__)if (-1 === [
package/package/dist/index.js	252	DYNAMIC_PROP_WRITE	].indexOf(__webpack_i__)) exports[__webpack_i__] = __webpack_exports__[__webpack_i__];
package/package/dist/sockets/WHMEventSource.js	5	NO_HASOWN	for(var key in definition)if (__webpack_require__.o(definition, key) && !__webpack_require__.o(exports1, key)) Object.defineProperty(exports1, key, {
package/package/dist/sockets/WHMEventSource.js	47	NO_HASOWN	for(var __webpack_i__ in __webpack_exports__)if (-1 === [
package/package/dist/sockets/WHMEventSource.js	49	DYNAMIC_PROP_WRITE	].indexOf(__webpack_i__)) exports[__webpack_i__] = __webpack_exports__[__webpack_i__];
package/package/dist/sockets/WDSSocket.js	14	NO_HASOWN	for(var key in definition)if (__webpack_require__.o(definition, key) && !__webpack_require__.o(exports1, key)) Object.defineProperty(exports1, key, {
package/package/dist/sockets/WDSSocket.js	58	NO_HASOWN	for(var __webpack_i__ in __webpack_exports__)if (-1 === [
package/package/dist/sockets/WDSSocket.js	60	DYNAMIC_PROP_WRITE	].indexOf(__webpack_i__)) exports[__webpack_i__] = __webpack_exports__[__webpack_i__];
package/package/dist/sockets/utils/getSocketUrlParts.js	14	NO_HASOWN	for(var key in definition)if (__webpack_require__.o(definition, key) && !__webpack_require__.o(exports1, key)) Object.defineProperty(exports1, key, {
package/package/dist/sockets/utils/getSocketUrlParts.js	46	DYNAMIC_PROP_WRITE	parsedQuery[key] = value;
package/package/dist/sockets/utils/getSocketUrlParts.js	81	DYNAMIC_PROP_WRITE	exports["default"] = __webpack_exports__["default"];
package/package/dist/sockets/utils/getSocketUrlParts.js	82	NO_HASOWN	for(var __webpack_i__ in __webpack_exports__)if (-1 === [
package/package/dist/sockets/utils/getSocketUrlParts.js	84	DYNAMIC_PROP_WRITE	].indexOf(__webpack_i__)) exports[__webpack_i__] = __webpack_exports__[__webpack_i__];
package/package/dist/sockets/utils/getCurrentScriptSource.js	5	NO_HASOWN	for(var key in definition)if (__webpack_require__.o(definition, key) && !__webpack_require__.o(exports1, key)) Object.defineProperty(exports1, key, {
package/package/dist/sockets/utils/getCurrentScriptSource.js	39	DYNAMIC_PROP_WRITE	exports["default"] = __webpack_exports__["default"];
package/package/dist/sockets/utils/getCurrentScriptSource.js	40	NO_HASOWN	for(var __webpack_i__ in __webpack_exports__)if (-1 === [
package/package/dist/sockets/utils/getCurrentScriptSource.js	42	DYNAMIC_PROP_WRITE	].indexOf(__webpack_i__)) exports[__webpack_i__] = __webpack_exports__[__webpack_i__];
package/package/dist/sockets/utils/getUrlFromParts.js	5	NO_HASOWN	for(var key in definition)if (__webpack_require__.o(definition, key) && !__webpack_require__.o(exports1, key)) Object.defineProperty(exports1, key, {
...	...	...	(47 more sinks)

Remediation

• Validate all configuration options and callbacks before use
• Avoid passing untrusted functions or objects as configuration
• Use TypeScript strict typing to prevent unexpected function injection
• Review all entry points that accept user-controlled configuration objects

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