{"id":"EM-20261110-PA7K","url":"https://cyber.eventmonitor.net/incident/EM-20261110-PA7K/critical-react-vulnerability-cve-2026-126187/","type":"cve","title":"Critical React Vulnerability (CVE-2026-126187)","subtitle":"CVE-2026-126187","subject":"CVE-2026-126187","status":"Developing","severity":"critical","affected":[],"headline":null,"born":"2026-11-10T23:17:20.687Z","firstSignal":"2026-11-10T22:44:12.000Z","lastSignal":"2026-11-10T23:17:20.687Z","updated":"2026-11-10T23:24:44.878Z","revision":1,"life":[{"status":"Born","at":"2026-11-10T23:17:20.687Z","why":"second independent source: C6 NVD CVE API 2.0"},{"status":"Developing","at":"2026-11-10T23:17:20.687Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-10T22:44:12.000Z","what":"First signal: C26 GitHub Advisory Database"},{"at":"2026-11-10T23:17:20.687Z","what":"Born: second source, C6 NVD CVE API 2.0. Page EM-20261110-PA7K created."}],"stages":[{"name":"Disclosed","at":"2026-11-10T23:17:20.687Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-10T23:17:20.687Z","detail":"CVSS 9.5"},{"name":"Exploited","at":null,"detail":"No exploitation reported"},{"name":"Advisories","at":null,"detail":"None yet"},{"name":"Vendor Response","at":null,"detail":"None in sources yet"},{"name":"Resolved","at":null,"detail":"After 14 quiet days"}],"signals":[{"at":"2026-11-10T22:44:12.000Z","source":"C26","sourceName":"GitHub Advisory Database","role":"Database","severity":4,"title":"GHSA-xqc2-xf4c-x3h3 / CVE-2026-126187: React: Unauthenticated Remote Code Execution in React Server Components","text":"npm:react-server-dom-parcel, npm:react-server-dom-parcel, npm:react-server-dom-parcel, npm:react-server-dom-parcel, npm:react-server-dom-turbopack, npm:react-server-dom-turbopack, npm:react-server-dom-turbopack, npm:react-server-dom-turbopack, npm:react-server-dom-webpack, npm:react-server-dom-webpack, npm:react-server-dom-webpack, npm:react-server-dom-webpack","url":"https://github.com/advisories/GHSA-xqc2-xf4c-x3h3"},{"at":"2026-11-10T23:17:20.687Z","source":"C6","sourceName":"NVD CVE API 2.0","role":"Database","severity":4,"title":"CVE-2026-126187 (CVSS 9.5)","text":"React is a JavaScript library for building user interfaces. From 19.0.0 until 19.0.9, 19.1.10, 19.2.9, and 19.3.1, the react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack packages are vulnerable to unauthenticated remote code execution through crafted payloads targeting frameworks that support React Server Components. The vulnerability only affects extremely rare cases where responses transport multiple typed arrays and an attacker-controlled value. Applications whose React code does not use a server are not affected. Applications that do not use a framework…","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126187"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-10T23:17:20.687","score":9.5,"severity":"CRITICAL","desc":"React is a JavaScript library for building user interfaces. From 19.0.0 until 19.0.9, 19.1.10, 19.2.9, and 19.3.1, the react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack packages are vulnerable to unauthenticated remote code execution through crafted payloads…","product":"","seen":1794353084878},"kev":null,"epss":null,"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}