Is CVE-2026-14631 actively exploited?

No active exploitation of CVE-2026-14631 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-14631 be exploited remotely?

Yes. CVE-2026-14631 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-14631?

CVE-2026-14631 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-14631

CWE-20Published: July 3, 2026· Updated: Jul 3, 2026

5.3

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2026-14631 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.