CVE-2026-14631
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| webpack-dev-server | webpack-dev-server | 0 < 5.2.6 | affected |
| webpack-dev-server | webpack-dev-server | 5.2.6 | unaffected |
Weaknesses
- CWE-20: CWE-20: Improper Input Validation
- CWE-248: CWE-248: Uncaught Exception
References
- https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-m28w-2pqf-7qgj
- https://cna.openjsf.org/security-advisories.html
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