{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "3.0.0"
              },
              {
                "fixed": "3.1.0"
              },
              {
                "introduced": "2.5.0"
              },
              {
                "fixed": "2.36.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "3cef8e0d9557bbde60c3f1bfd2cbb1004af7fc9a"
            },
            {
              "introduced": "240028f49fcbe5a9ba16334a19a3bb120b5c22fc"
            },
            {
              "fixed": "4c883fdb0f0e7ea577f851bd457024f7e88788c9"
            },
            {
              "fixed": "5ccec9746faa28d79a87138042174c3853d5702b"
            },
            {
              "fixed": "95e878d5257f13d6d652ca95e3ef6bb0934d674f"
            }
          ],
          "repo": "https://github.com/symfony/ux",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-mm82-c99c-h2cf"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49209.json"
  },
  "details": "Symfony UX is a JavaScript ecosystem for Symfony. From 2.5.0 until 2.36.0 and 3.1.0, Symfony\\UX\\LiveComponent\\Controller\\BatchActionController::__invoke() iterates over the client-supplied actions array and issues a full HttpKernel sub-request for each entry; because the array size is never bounded, an authenticated client can submit a single _batch request containing thousands of actions and exhaust CPU, memory, and database connections on the application server. This issue is fixed in versions 2.36.0 and 3.1.0.",
  "id": "CVE-2026-49209",
  "modified": "2026-07-19T03:31:16.137652616Z",
  "published": "2026-07-17T16:02:06.498Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/symfony/ux/releases/tag/v2.36.0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/symfony/ux/releases/tag/v3.1.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49209.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/symfony/ux/security/advisories/GHSA-mm82-c99c-h2cf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49209"
    },
    {
      "type": "FIX",
      "url": "https://github.com/symfony/ux/commit/95e878d5257f13d6d652ca95e3ef6bb0934d674f"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Symfony UX: Denial of service in symfony/ux-live-component via unbounded batch action requests"
}