CVE-2026-14631
webpack-dev-server versions 5.2.5 and earlier terminate the whole Node.js process when an unauthenticated peer sends either a normal HTTP request with a malfor…
Impact
webpack-dev-server versions 5.2.5 and earlier terminate the whole Node.js process when an unauthenticated peer sends either a normal HTTP request with a malformed Host header or a WebSocket upgrade to the default /ws endpoint with a malformed Origin header. The malformed value causes an uncaught exception in the host-validation path and crashes the dev server. Impact is limited to availability of the development server, no data disclosure, no code execution. Patches: upgrade to webpack-dev-server 5.2.6. Workarounds: keep the dev server bound to localhost (the default) and do not expose it to untrusted networks.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | webpack-dev-server | <= 5.2.5 | 5.2.6 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Webpack.Js | Webpack-Dev-Server | before 5.2.6 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-m28w-2pqf-7qgj
- https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-m28w-2pqf-7qgj
- https://nvd.nist.gov/vuln/detail/CVE-2026-14631
- https://github.com/webpack/webpack-dev-server/pull/5699
- https://github.com/webpack/webpack-dev-server/commit/f21ed0f44aceb6132abb591ee8b60d770b6e489f
- https://cna.openjsf.org/security-advisories.html