chore(deps): update dependency webpack-dev-middleware to v7 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
webpack-dev-middleware	4.1.0 → 7.4.6

---

Path traversal in webpack-dev-middleware

CVE-2024-29180 / GHSA-wr3j-pwj9-hqq6

More information

Details

Summary

The webpack-dev-middleware middleware does not validate the supplied URL address sufficiently before returning the local file. It is possible to access any file on the developer's machine.

Details

The middleware can either work with the physical filesystem when reading the files or it can use a virtualized in-memory memfs filesystem.
If writeToDisk configuration option is set to true, the physical filesystem is used:
https://github.com/webpack/webpack-dev-middleware/blob/7ed24e0b9f53ad1562343f9f517f0f0ad2a70377/src/utils/setupOutputFileSystem.js#L21

The getFilenameFromUrl method is used to parse URL and build the local file path.
The public path prefix is stripped from the URL, and the unsecaped path suffix is appended to the outputPath:
https://github.com/webpack/webpack-dev-middleware/blob/7ed24e0b9f53ad1562343f9f517f0f0ad2a70377/src/utils/getFilenameFromUrl.js#L82
As the URL is not unescaped and normalized automatically before calling the midlleware, it is possible to use %2e and %2f sequences to perform path traversal attack.

PoC

A blank project can be created containing the following configuration file webpack.config.js:
module.exports = { devServer: { devMiddleware: { writeToDisk: true } } };

When started, it is possible to access any local file, e.g. /etc/passwd:
$ curl localhost:8080/public/..%2f..%2f..%2f..%2f../etc/passwd

root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin

Impact

The developers using webpack-dev-server or webpack-dev-middleware are affected by the issue. When the project is started, an attacker might access any file on the developer's machine and exfiltrate the content (e.g. password, configuration files, private source code, ...).

If the development server is listening on a public IP address (or 0.0.0.0), an attacker on the local network can access the local files without any interaction from the victim (direct connection to the port).

If the server allows access from third-party domains (CORS, Allow-Access-Origin: * ), an attacker can send a malicious link to the victim. When visited, the client side script can connect to the local server and exfiltrate the local files.

Recommendation

The URL should be unescaped and normalized before any further processing.

Severity

• CVSS Score: 7.4 / 10 (High)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

References

• https://github.com/webpack/webpack-dev-middleware/security/advisories/GHSA-wr3j-pwj9-hqq6
• https://nvd.nist.gov/vuln/detail/CVE-2024-29180
• https://github.com/webpack/webpack-dev-middleware/commit/189c4ac7d2344ec132a4689e74dc837ec5be0132
• https://github.com/webpack/webpack-dev-middleware/commit/9670b3495da518fe667ff3428c5e4cb9f2f3d353
• https://github.com/webpack/webpack-dev-middleware/commit/e10008c762e4d5821ed6990348dabf0d4d93a10e
• https://github.com/webpack/webpack-dev-middleware/blob/7ed24e0b9f53ad1562343f9f517f0f0ad2a70377/src/utils/getFilenameFromUrl.js#L82
• https://github.com/webpack/webpack-dev-middleware/blob/7ed24e0b9f53ad1562343f9f517f0f0ad2a70377/src/utils/setupOutputFileSystem.js#L21
• https://github.com/webpack/webpack-dev-middleware/releases/tag/v5.3.4
• https://github.com/webpack/webpack-dev-middleware/releases/tag/v6.1.2
• https://github.com/webpack/webpack-dev-middleware/releases/tag/v7.1.0
• https://github.com/advisories/GHSA-wr3j-pwj9-hqq6

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

---

webpack-dev-middleware vulnerable to Path Traversal via non-slash-terminated publicPath

CVE-2026-76844 / GHSA-g84c-rxfj-3j2c

More information

Details

[!IMPORTANT]
CVE-2026-76844 was assigned and published for this issue by VulnCheck on 2026-08-24 without prior coordination with the webpack maintainers or the OpenJS Foundation, which holds the CVE Numbering Authority scope for webpack projects. Neither the maintainers nor the OpenJS CNA were notified before publication, and no fix was available at that time. This advisory is the coordinated record produced by the webpack maintainers and the OpenJS Foundation CNA.

Impact

webpack-dev-middleware resolves a request to a local file in getFilenameFromUrl. When the configured publicPath has no trailing slash (for example /assets), a request that shares that prefix without being under it (for example /assets../secret) still passes the containment check, and the .. guard does not catch it because it runs on the path before the publicPath prefix is stripped. The stripped remainder then escapes the configured output directory once joined, so an unauthenticated request can read files outside the output root. Applications serving webpack-dev-middleware (directly or via webpack-dev-server) with a publicPath that does not end in a slash are affected. A development server reachable on the network can be attacked with a single request and no victim interaction.

Patches

Patched in webpack-dev-middleware 8.3.0. There is no backport to the 5.x, 6.x, or 7.x lines; users on those lines should upgrade to 8.3.0 or later.

Workarounds

Configure publicPath with a trailing slash (for example /assets/ instead of /assets), or upgrade to a patched version.

References

• CVE-2024-29180 (GHSA-wr3j-pwj9-hqq6), the earlier path traversal in the same component that this issue bypasses.

Severity

• CVSS Score: 7.4 / 10 (High)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

References

• https://github.com/webpack/webpack-dev-middleware/security/advisories/GHSA-g84c-rxfj-3j2c
• https://nvd.nist.gov/vuln/detail/CVE-2026-76844
• https://github.com/webpack/webpack-dev-middleware/pull/2404
• https://github.com/webpack/webpack-dev-middleware/commit/13344e78b26d88fe9b7c8381a3860e248a52359b
• https://github.com/webpack/webpack-dev-middleware/commit/cefccbac330c29052fc6dffe85fd292ea2ac782b
• https://github.com/advisories/GHSA-wr3j-pwj9-hqq6
• https://github.com/webpack/webpack-dev-middleware/blob/v8.1.1/src/middleware.js
• https://github.com/webpack/webpack-dev-middleware/releases/tag/v7.4.6
• https://github.com/webpack/webpack-dev-middleware/releases/tag/v8.3.0
• https://www.vulncheck.com/advisories/webpack-dev-middleware-path-traversal-via-offset-slice-on-a-non-slash-terminated-publicpath
• https://github.com/advisories/GHSA-g84c-rxfj-3j2c

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

---

Release Notes

webpack/webpack-dev-middleware (webpack-dev-middleware)

v7.4.6

Compare Source

7.4.6 (2026-09-03)

Bug Fixes

• reject requests that resolve outside the output directory

v7.4.5

Compare Source

v7.4.4

Compare Source

v7.4.3

Compare Source

v7.4.2

Compare Source

v7.4.1

Compare Source

v7.4.0

Compare Source

Features

• added the cacheImmutable option to cache immutable assets (assets with a hash in file name like image.e12ab567.jpg) (5ed629d)
• allow to configure the Cache-Control header (#​1923) (f7529c3)

Bug Fixes

• support devServer: false (b443f4d)

v7.3.0

Compare Source

Features

• support hono (#​1890) (0f9f398)

7.2.1 (2024-04-02)

Bug Fixes

• avoid extra log

v7.2.1

Compare Source

Features

• support hono (#​1890) (0f9f398)

7.2.1 (2024-04-02)

Bug Fixes

• avoid extra log

v7.2.0

Compare Source

Features

• support hono (#​1890) (0f9f398)

7.2.1 (2024-04-02)

Bug Fixes

• avoid extra log

v7.1.1

Compare Source

Features

• hapi support (b3f9126)
• koa support (#​1792) (458c17c)
• support ETag header generation (#​1797) (b759181)
• support Last-Modified header generation (#​1798) (18e5683)

7.1.1 (2024-03-21)

Bug Fixes

• ContentLength incorrectly set for empty files (#​1785) (0f3e25e)
• improve perf (#​1777) (5b47c92)
• types: make types better (#​1786) (e4d183e)

v7.1.0

Compare Source

Features

• hapi support (b3f9126)
• koa support (#​1792) (458c17c)
• support ETag header generation (#​1797) (b759181)
• support Last-Modified header generation (#​1798) (18e5683)

7.1.1 (2024-03-21)

Bug Fixes

• ContentLength incorrectly set for empty files (#​1785) (0f3e25e)
• improve perf (#​1777) (5b47c92)
• types: make types better (#​1786) (e4d183e)

v7.0.0

Compare Source

⚠ BREAKING CHANGES

• minimum supported Node.js version is 18.12.0 (#​1694)
• updated memfs@​4 (#​1693)

Features

• updated memfs@​4 (#​1693) (244d9f8)

• minimum supported Node.js version is 18.12.0 (#​1694) (e273d61)

6.1.1 (2023-05-16)

Bug Fixes

• types: methods should be string array (#​1550) (41b2f77)

v6.1.3

Compare Source

6.1.3 (2024-03-29)

Bug Fixes

• security problem (#​1799) (5a4d9e8)

v6.1.2

Compare Source

6.1.2 (2024-03-20)

Bug Fixes

• security: do not allow to read files above (#​1778) (9670b34)

v6.1.1

Compare Source

⚠ BREAKING CHANGES

• minimum supported Node.js version is 18.12.0 (#​1694)
• updated memfs@​4 (#​1693)

Features

• updated memfs@​4 (#​1693) (244d9f8)

• minimum supported Node.js version is 18.12.0 (#​1694) (e273d61)

6.1.1 (2023-05-16)

Bug Fixes

• types: methods should be string array (#​1550) (41b2f77)

v6.1.0

Compare Source

⚠ BREAKING CHANGES

• minimum supported Node.js version is 18.12.0 (#​1694)
• updated memfs@​4 (#​1693)

Features

• updated memfs@​4 (#​1693) (244d9f8)

• minimum supported Node.js version is 18.12.0 (#​1694) (e273d61)

6.1.1 (2023-05-16)

Bug Fixes

• types: methods should be string array (#​1550) (41b2f77)

v6.0.2

Compare Source

Features

• added mimeTypeDefault option (#​1527) (503d290)
• added modifyResponseData option (#​1529) (35dac70)

Bug Fixes

• don't use memory-fs when writeToDisk is true (#​1537) (852245e)
• faster startup time (f5f033b)

6.0.2 (2023-03-19)

Bug Fixes

• make webpack optional peerDep (#​1488) (81c39ba)

6.0.1 (2022-11-28)

Bug Fixes

• update schema for index and methods properties (#​1397) (cda328e)

v6.0.1

Compare Source

Features

• added mimeTypeDefault option (#​1527) (503d290)
• added modifyResponseData option (#​1529) (35dac70)

Bug Fixes

• don't use memory-fs when writeToDisk is true (#​1537) (852245e)
• faster startup time (f5f033b)

6.0.2 (2023-03-19)

Bug Fixes

• make webpack optional peerDep (#​1488) (81c39ba)

6.0.1 (2022-11-28)

Bug Fixes

• update schema for index and methods properties (#​1397) (cda328e)

v6.0.0

Compare Source

Features

• added mimeTypeDefault option (#​1527) (503d290)
• added modifyResponseData option (#​1529) (35dac70)

Bug Fixes

• don't use memory-fs when writeToDisk is true (#​1537) (852245e)
• faster startup time (f5f033b)

6.0.2 (2023-03-19)

Bug Fixes

• make webpack optional peerDep (#​1488) (81c39ba)

6.0.1 (2022-11-28)

Bug Fixes

• update schema for index and methods properties (#​1397) (cda328e)

v5.3.4

Compare Source

5.3.4 (2024-03-20)

Bug Fixes

• security: do not allow to read files above (#​1779) (189c4ac)

v5.3.3

Compare Source

⚠ BREAKING CHANGES

• minimum supported webpack version is 5.0.0
• minimum supported Nodejs version is 14.15.0

5.3.3 (2022-05-18)

Bug Fixes

• types for Request and Response (#​1271) (eeb8aa8)

5.3.2 (2022-05-17)

Bug Fixes

• node types (#​1195) (d68ab36)

5.3.1 (2022-02-01)

Bug Fixes

• types (#​1187) (0f82e1d)

v5.3.2

Compare Source

⚠ BREAKING CHANGES

• minimum supported webpack version is 5.0.0
• minimum supported Nodejs version is 14.15.0

5.3.3 (2022-05-18)

Bug Fixes

• types for Request and Response (#​1271) (eeb8aa8)

5.3.2 (2022-05-17)

Bug Fixes

• node types (#​1195) (d68ab36)

5.3.1 (2022-02-01)

Bug Fixes

• types (#​1187) (0f82e1d)

v5.3.1

Compare Source

⚠ BREAKING CHANGES

• minimum supported webpack version is 5.0.0
• minimum supported Nodejs version is 14.15.0

5.3.3 (2022-05-18)

Bug Fixes

• types for Request and Response (#​1271) (eeb8aa8)

5.3.2 (2022-05-17)

Bug Fixes

• node types (#​1195) (d68ab36)

5.3.1 (2022-02-01)

Bug Fixes

• types (#​1187) (0f82e1d)

v5.3.0

Compare Source

⚠ BREAKING CHANGES

• minimum supported webpack version is 5.0.0
• minimum supported Nodejs version is 14.15.0

5.3.3 (2022-05-18)

Bug Fixes

• types for Request and Response (#​1271) (eeb8aa8)

5.3.2 (2022-05-17)

Bug Fixes

• node types (#​1195) (d68ab36)

5.3.1 (2022-02-01)

Bug Fixes

• types (#​1187) (0f82e1d)

v5.2.2

Compare Source

Features

• added types (a2fa77f)
• removed cjs wrapper (#​1146) (b6d53d3)

5.2.2 (2021-11-17)

Chore

• update schema-utils package to 4.0.0 version

5.2.1 (2021-09-25)

• internal release, no visible changes and features

v5.2.1

Compare Source

Features

• added types (a2fa77f)
• removed cjs wrapper (#​1146) (b6d53d3)

5.2.2 (2021-11-17)

Chore

• update schema-utils package to 4.0.0 version

5.2.1 (2021-09-25)

• internal release, no visible changes and features

v5.2.0

Compare Source

Features

• added types (a2fa77f)
• removed cjs wrapper (#​1146) (b6d53d3)

5.2.2 (2021-11-17)

Chore

• update schema-utils package to 4.0.0 version

5.2.1 (2021-09-25)

• internal release, no visible changes and features

v5.1.0

Compare Source

Features

• don't read full file if Range header is present (e8b21f0)
• output more information on errors (#​1024) (7df9e44)

Bug Fixes

• reduced package size by removing mem package (#​1027) (0d55268)

v5.0.0

Compare Source

⚠ BREAKING CHANGES

• minimum supported Node.js version is 12.13.0 (#​928) (4cffeff)

v4.3.0

Compare Source

Features

• add getFilenameFromUrl to API (#​911) (1edc726)

Bug Fixes

• husky config (#​904) (8a423be)
• typo depandabot -> dependabot (#​905) (7062990)

v4.2.0

Compare Source

Features

• allow the headers option to accept function (#​897) (966afb3)

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