CVE-2026-14631
CVE-2026-14631 · webpack-dev-server vulnerable to denial of service via a malformed Host or Origin header
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 5.3 · Medium · EPSS 0.5% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
webpack-dev-server
- Versions
- ≥ 0, < 5.2.6: Affected (semver)
- 5.2.6: Not affected (semver)
Update to 5.2.6
webpack-dev-server npm
- Affected ranges
- SEMVER: < 5.2.6
Update to 5.2.6