Vulnerabilities in pkg:npm/webpack-dev-server

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-m28w-2pqf-7qgj",
  "modified" : "2026-07-20T22:02:31Z",
  "published" : "2026-07-20T22:02:31Z",
  "aliases" : [ "CVE-2026-14631" ],
  "summary" : "webpack-dev-server vulnerable to denial of service via a malformed Host or Origin header",
  "details" : "### Impact\n\nAn unauthenticated peer that can reach the `webpack-dev-server` process can terminate it by sending 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 header triggers an uncaught exception in the host-validation path and crashes the dev server process.\n\n### Patches\n\nFixed in `webpack-dev-server` 5.2.6 by treating malformed `Host` and `Origin` header values as invalid rather than throwing (see [PR #5699](https://github.com/webpack/webpack-dev-server/pull/5699)).\n\n### Workarounds\n\nKeep the dev server bound to `localhost` (the default) and do not expose it to untrusted networks.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "webpack-dev-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.2.6"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.2.5"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-m28w-2pqf-7qgj"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-14631"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/webpack/webpack-dev-server/pull/5699"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/webpack/webpack-dev-server/commit/f21ed0f44aceb6132abb591ee8b60d770b6e489f"
  }, {
    "type" : "WEB",
    "url" : "https://cna.openjsf.org/security-advisories.html"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/webpack/webpack-dev-server"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20", "CWE-248" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-20T22:02:31Z",
    "nvd_published_at" : "2026-07-03T18:16:24Z"
  }
}