{"cve":"CVE-2026-14631","nvd":{"published":"2026-07-03T18:16:24.687","modified":"2026-07-07T15:08:59.667","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3},"cwes":["CWE-20","CWE-248"],"references":["https://cna.openjsf.org/security-advisories.html","https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-m28w-2pqf-7qgj"],"products":["webpack.js:webpack-dev-server"],"source":"nvd","synced_at":"2026-10-19T22:42:16.820116992+00:00"},"epss":{"cve":"CVE-2026-14631","score":0.00517,"percentile":0.43994,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-m28w-2pqf-7qgj","url":"https://osv.dev/vulnerability/GHSA-m28w-2pqf-7qgj","summary":"webpack-dev-server vulnerable to denial of service via a malformed Host or Origin header","modified":"2026-09-10T03:50:52.455906127Z","packages":[{"ecosystem":"npm","name":"webpack-dev-server","purl":"pkg:npm/webpack-dev-server","ranges":["<5.2.6"],"fixed":["5.2.6"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}