CVE-2026-120215

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{"bugzilla": {"description": "@fastify/cors: @fastify/cors: Denial of Service via CORS preflight requests", "id": "2565024", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2565024"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-248", "details": ["@fastify/cors is the CORS plugin for the Fastify web framework. In versions 8.2.0 through 11.3.x, an application that registers the plugin with the non-default onSend hook option crashes on a CORS preflight. On an OPTIONS request that carries the Origin and Access-Control-Request-Method headers, the plugin calls reply.send from inside the onSend hook and re-enters the send pipeline, so a second write of the response headers throws an uncaught ERR_HTTP_HEADERS_SENT that can terminate the Node.js process when no process-level handler is installed. An unauthenticated remote client can trigger this with a single preflight request, so the impact is availability only, and exploitation requires the non-default onSend configuration. The issue is fixed in @fastify/cors 11.4.0, where onSend is no longer an accepted hook value and registration fails with a clear error instead of crashing at request time, and users should upgrade to 11.4.0 or later. As a workaround, use any other hook such as the default onRequest, or set preflight to false.", "A flaw was found in @fastify/cors. An unauthenticated remote attacker can cause a Denial of Service (DoS) by sending a Cross-Origin Resource Sharing (CORS) preflight request to an application configured with a non-default hook. Under these conditions, the plugin improperly attempts to write response headers multiple times, triggering an unhandled error that can crash the server process."], "name": "CVE-2026-120215", "package_state": [{"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Fix deferred", "package_name": "devspaces/dashboard-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}], "public_date": "2026-11-02T10:20:47Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-120215\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-120215\nhttps://cna.openjsf.org/security-advisories.html\nhttps://github.com/fastify/fastify-cors/security/advisories/GHSA-8c3j-mm64-257c"], "threat_severity": "Low"}

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