{"api_version":"1","generated_at":"2026-07-07T18:17:24+00:00","cve":"CVE-2026-14631","urls":{"html":"https://cve.report/CVE-2026-14631","api":"https://cve.report/api/cve/CVE-2026-14631.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-14631","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-14631"},"summary":{"title":"webpack-dev-server vulnerable to denial of service via a malformed Host or Origin header","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.","state":"PUBLISHED","assigner":"openjs","published_at":"2026-07-03 18:16:24","updated_at":"2026-07-07 15:08:59"},"problem_types":["CWE-20","CWE-248","CWE-20 CWE-20: Improper Input Validation","CWE-248 CWE-248: Uncaught Exception"],"metrics":[{"version":"3.1","source":"ce714d77-add3-4f53-aff5-83d477b104bb","type":"Secondary","score":"5.3","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","data":{"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"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"5.3","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","data":{"baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"}}],"references":[{"url":"https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-m28w-2pqf-7qgj","name":"https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-m28w-2pqf-7qgj","refsource":"ce714d77-add3-4f53-aff5-83d477b104bb","tags":["Mitigation","Vendor Advisory","Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://cna.openjsf.org/security-advisories.html","name":"https://cna.openjsf.org/security-advisories.html","refsource":"ce714d77-add3-4f53-aff5-83d477b104bb","tags":["Third Party Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-14631","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-14631","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"webpack-dev-server","product":"webpack-dev-server","version":"affected 5.2.6 semver","platforms":[]},{"source":"CNA","vendor":"webpack-dev-server","product":"webpack-dev-server","version":"unaffected 5.2.6 semver","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"Str1ckl4nd","lang":"en"},{"source":"CNA","value":"bjohansebas","lang":"en"},{"source":"CNA","value":"UlisesGascon","lang":"en"}],"nvd_cpes":[{"cve_year":"2026","cve_id":"14631","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"webpack.js","cpe5":"webpack-dev-server","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"14631","cve":"CVE-2026-14631","epss":"0.003080000","percentile":"0.225910000","score_date":"2026-07-06","updated_at":"2026-07-07 00:05:10"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-14631","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-07-06T15:54:04.567228Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-07-06T15:54:11.285Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","packageURL":"pkg:npm/webpack-dev-server","product":"webpack-dev-server","vendor":"webpack-dev-server","versions":[{"lessThan":"5.2.6","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"5.2.6","versionType":"semver"}]}],"credits":[{"lang":"en","type":"reporter","value":"Str1ckl4nd"},{"lang":"en","type":"coordinator","value":"bjohansebas"},{"lang":"en","type":"analyst","value":"UlisesGascon"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","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."}],"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."}],"metrics":[{"cvssV3_1":{"baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-248","description":"CWE-248: Uncaught Exception","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-07-03T17:23:41.451Z","orgId":"ce714d77-add3-4f53-aff5-83d477b104bb","shortName":"openjs"},"references":[{"url":"https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-m28w-2pqf-7qgj"},{"url":"https://cna.openjsf.org/security-advisories.html"}],"title":"webpack-dev-server vulnerable to denial of service via a malformed Host or Origin header","x_generator":{"engine":"cve-kit 1.0.0"}}},"cveMetadata":{"assignerOrgId":"ce714d77-add3-4f53-aff5-83d477b104bb","assignerShortName":"openjs","cveId":"CVE-2026-14631","datePublished":"2026-07-03T17:23:41.451Z","dateReserved":"2026-07-03T17:15:55.995Z","dateUpdated":"2026-07-06T15:54:11.285Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-03 18:16:24","lastModifiedDate":"2026-07-07 15:08:59","problem_types":["CWE-20","CWE-248","CWE-20 CWE-20: Improper Input Validation","CWE-248 CWE-248: Uncaught Exception"],"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"}}]},"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"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"14631","Ordinal":"1","Title":"webpack-dev-server vulnerable to denial of service via a malform","CVE":"CVE-2026-14631","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"14631","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"webpack-dev-server vulnerable to denial of service via a malform"}]}}}