{"id":"CVE-2026-14631","sourceIdentifier":"ce714d77-add3-4f53-aff5-83d477b104bb","published":"2026-07-03T18:16:24.687","lastModified":"2026-07-07T15:08:59.667","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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."}],"affected":[{"source":"ce714d77-add3-4f53-aff5-83d477b104bb","affectedData":[{"vendor":"webpack-dev-server","product":"webpack-dev-server","defaultStatus":"unaffected","packageURL":"pkg:npm/webpack-dev-server","versions":[{"version":"0","lessThan":"5.2.6","versionType":"semver","status":"affected"},{"version":"5.2.6","versionType":"semver","status":"unaffected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"ce714d77-add3-4f53-aff5-83d477b104bb","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW"},"exploitabilityScore":3.9,"impactScore":1.4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-06T15:54:04.567228Z","id":"CVE-2026-14631","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"ce714d77-add3-4f53-aff5-83d477b104bb","type":"Secondary","description":[{"lang":"en","value":"CWE-20"},{"lang":"en","value":"CWE-248"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:webpack.js:webpack-dev-server:*:*:*:*:*:*:*:*","versionEndExcluding":"5.2.6","matchCriteriaId":"18354AA3-AA9C-44CC-AC11-E305120D5261"}]}]}],"references":[{"url":"https://cna.openjsf.org/security-advisories.html","source":"ce714d77-add3-4f53-aff5-83d477b104bb","tags":["Third Party Advisory"]},{"url":"https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-m28w-2pqf-7qgj","source":"ce714d77-add3-4f53-aff5-83d477b104bb","tags":["Mitigation","Vendor Advisory","Patch"]}]}