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CVE-2026-14631

MEDIUM
5.3
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-14631
State
PUBLISHED
Assigner
openjs
Reserved
2026-07-03 17:15 UTC
Published
2026-07-03 17:23 UTC
Last updated
2026-07-03 17:23 UTC
Primary CWE
CWE-20
CWE-20: Improper Input Validation
Vendor / Product
webpack-dev-server / webpack-dev-server
Sources
cve.org  ·  NVD

Severity & Metrics

5.3 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products (1)
VendorProductPlatformVersions
webpack-dev-server webpack-dev-server — 0 < 5.2.6, 5.2.6
Weakness (CWE)
CWESourceDescription
CWE-20 cna CWE-20: Improper Input Validation
CWE-248 cna CWE-248: Uncaught Exception
CVSS scores (1)
ScoreSeverityVersionSourceVector
5.3 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References (2)
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