{"cve":{"cve_id":"CVE-2026-14631","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00517,"epss_percentile":0.41744,"epss_as_of":"2026-08-26","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.","published_at":"2026-07-03T17:23:41.451000Z","last_modified_at":"2026-07-07T15:08:59.667000Z","cvss_v3_score":5.3,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":true,"ssvc_technical_impact":"partial","cwes":["CWE-20","CWE-248"],"nvd_references":["https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-m28w-2pqf-7qgj","https://cna.openjsf.org/security-advisories.html"],"vuln_status":"Analyzed","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-07-03T19:34:23.733395Z","updated_at":"2026-07-08T03:21:14.986216Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"L","value_label":"Low"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"webpack-dev-server","vendor_name":"webpack-dev-server","product_slug":"webpack-dev-server","product_name":"webpack-dev-server","version_start":"0","version_start_inclusive":true,"version_end":"5.2.6","version_end_inclusive":false,"cpe23_uri":"cve5:webpack-dev-server:webpack-dev-server:0:5.2.6"},{"vendor_slug":"webpack-dev-server","vendor_name":"webpack-dev-server","product_slug":"webpack-dev-server","product_name":"webpack-dev-server","version_start":"5.2.6","version_start_inclusive":true,"version_end":"5.2.6","version_end_inclusive":true,"cpe23_uri":"cve5:webpack-dev-server:webpack-dev-server:5.2.6:5.2.6"},{"vendor_slug":"webpack.js","vendor_name":"webpack.js","product_slug":"webpack-dev-server","product_name":"webpack-dev-server","version_start":null,"version_start_inclusive":null,"version_end":"5.2.6","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:webpack.js:webpack-dev-server:*:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-m28w-2pqf-7qgj","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://cna.openjsf.org/security-advisories.html","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2026-07-03T17:23:41.451000Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-07-06T17:42:58.941016Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-07-06T17:42:58.941016Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-07-06T17:42:58.941016Z","label":"SSVC decision revised","source":"vulnrichment"}]}