VULNERABILITY INTELLIGENCE

CVE-2026-14631

CVSS score5.3 MEDIUM
EPSS probability0.52%
CISA KEVNot currently listed
Published2026-07-03
Last modified2026-07-07
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Description

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.

Weakness classification

  • CWE-20: Improper Input Validation
  • CWE-248: Uncaught Exception

Primary references