CVE-2026-27482: Ray Denial of Service Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-q5fh-2hc8-f6rq",
  "modified" : "2026-02-23T22:30:32Z",
  "published" : "2026-02-20T21:15:25Z",
  "aliases" : [ "CVE-2026-27482" ],
  "summary" : "Ray dashboard DELETE endpoints allow unauthenticated browser-triggered DoS (Serve shutdown / job deletion)",
  "details" : "### Summary\n\n  Ray’s dashboard HTTP server blocks browser-origin POST/PUT but does not cover DELETE, and key DELETE endpoints are unauthenticated by default. If the dashboard/agent is reachable (e.g., --dashboard-host=0.0.0.0), a web page via DNS rebinding or same-network access can\n  issue DELETE requests that shut down Serve or delete jobs without user interaction. This is a drive-by availability impact.\n\n  ### Details\n\n  - Middleware: python/ray/dashboard/http_server_head.py#get_browsers_no_post_put_middleware only checks POST/PUT via is_browser_request (UA/Origin/Sec-Fetch heuristics). DELETE is not gated.\n  - Endpoints lacking browser protection/auth by default:\n      - python/ray/dashboard/modules/serve/serve_head.py: @routes.delete(\"/api/serve/applications/\") calls serve.shutdown().\n      - python/ray/dashboard/modules/job/job_head.py: @routes.delete(\"/api/jobs/{job_or_submission_id}\").\n      - python/ray/dashboard/modules/job/job_agent.py: @routes.delete(\"/api/job_agent/jobs/{job_or_submission_id}\") (not wrapped with deny_browser_requests either).\n  - Dashboard token auth is optional and off by default; binding to 0.0.0.0 is common for remote access.\n\n  ### PoC\n\n  Prereqs: dashboard reachable (e.g., ray start --head --dashboard-host=0.0.0.0), no token auth.\n\n  1. Start Serve (or have jobs present).\n  2. From any browser-reachable origin (DNS rebinding or same-LAN page), issue a DELETE fetch:\n\n```  \nfetch(\"http://<dashboard-host>:8265/api/serve/applications/\", {\n    method: \"DELETE\",\n    headers: { \"User-Agent\": \"Mozilla/5.0\" }  // browsers set this automatically\n  });\n```\n\n  Result: Serve shuts down.\n  3) Similarly, delete jobs:\n\n ` fetch(\"http://<dashboard-host>:8265/api/jobs/<job_or_submission_id>\", { method: \"DELETE\" });`\n ` fetch(\"http://<dashboard-agent>:52365/api/job_agent/jobs/<job_or_submission_id>\", { method: \"DELETE\" });`\n\n  Browsers will send the Mozilla UA and Origin/Sec-Fetch headers, but DELETE is not blocked by the middleware, so the requests succeed.\n\n  ### Impact\n\n  - Availability loss: Serve shutdown; job deletion. Triggerable via drive-by browser requests if the dashboard/agent ports are reachable and auth is disabled (default).\n  - No code execution from this vector, but breaks isolation/trust assumptions for “developer-only” endpoints.\n  \n### Fix\nThe fix for this vulnerability is to update to Ray 2.54.0 or higher. \n\nFix PR: https://github.com/ray-project/ray/pull/60526",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "ray"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.54.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/ray-project/ray/security/advisories/GHSA-q5fh-2hc8-f6rq"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-27482"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ray-project/ray/pull/60526"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ray-project/ray/commit/0fda8b824cdc9dc6edd763bb28dfd7d1cc9b02a4"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ray-project/ray"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ray-project/ray/releases/tag/ray-2.54.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-306", "CWE-396" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-20T21:15:25Z",
    "nvd_published_at" : "2026-02-21T10:16:12Z"
  }
}