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Back to active CVEs
High · CVSS 8.2CVE-2026-112085

webpack-dev-server vulnerable to cross-origin WebSocket access via proxied upgradesCVE-2026-112085

Answer in brief

CVE-2026-112085 records a High severity (CVSS 8.2) vulnerability in webpack-dev-server vulnerable to cross-origin WebSocket access via proxied upgrades. The current sources do not mark it as known exploited. The current feed maps webpack-dev-server/webpack-dev-server (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 22, 2026Updated Oct 22, 2026Source checked Oct 22, 2026First seen by HOL Oct 22, 2026Material review Oct 22, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.2
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps webpack-dev-server/webpack-dev-server (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
webpack-dev-server/webpack-dev-servergeneric>=0 <5.2.7 || >=6.0.0 <6.1.05.2.7, 6.1.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for webpack-dev-server/webpack-dev-server.
  2. 2Review the reported fix. Update webpack-dev-server/webpack-dev-server to 5.2.7 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 22, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 22, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 22, 2026

Sources and claim methodology

  • Source referencecna.openjsf.org
  • GitHub security advisorygithub.com
Upstream source description

webpack-dev-server is a development server that provides live reloading for webpack projects. In versions before 5.2.7 and in version 6.0.0, when a proxy entry is configured to forward WebSockets, the server forwards non-HMR WebSocket upgrade requests to the proxy target without validating the Host or Origin headers, so the allowedHosts protection does not apply to those proxied upgrades. A malicious web page visited by a developer can open a cross-origin WebSocket through the dev server and read from and write to the proxied backend, even when the server is bound to loopback. The issue is fixed in webpack-dev-server 5.2.7 and 6.1.0, where proxied WebSocket upgrades pass the same Host and Origin validation as the HMR WebSocket, and users should upgrade to one of those versions or later. As a workaround, omit WebSocket forwarding from proxy entries that do not need it and scope the proxy to specific paths.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • webpack-dev-server vulnerable to information disclosure via Host validation bypass in the open-editor endpointSame webpack-dev-server/webpack-dev-server package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-346, CWE-1385
Source
CVE List V5
Source checked
Oct 22, 2026
References
2 linked sources
Open source record