{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.6.0"
              },
              {
                "fixed": "1.11.1"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "b5e7d9bfc9effe8ec723af942c66df042ad17fe6"
            },
            {
              "fixed": "b6d4688790adf3797071fcf88a3fc4225f30486a"
            },
            {
              "fixed": "e5b8eb2654dec6cbbc692a39f05ea4ecd40c8cc1"
            }
          ],
          "repo": "https://github.com/reactphp/http",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-x424-64qh-5j54"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-835"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84997.json"
  },
  "details": "react/http is an event-driven, streaming HTTP client and server implementation for ReactPHP. From 0.6.0 until 1.11.1, React\\Http\\Io\\ChunkedDecoder could enter an infinite loop while processing a malformed Transfer-Encoding: chunked body because handleData required its buffer to shrink on every iteration. An incomplete terminal-chunk trailer without CRLF left the buffer unchanged after strpos returned false, and exactly two non-CRLF bytes after a completed non-terminal chunk bypassed both the error and wait guards. The affected decoder processes request bodies for React\\Http\\HttpServer and response bodies for React\\Http\\Browser, allowing a malicious client to freeze a server or a malicious or compromised server to freeze a client. A reverse proxy that normalizes inbound requests may protect the server direction but does not protect outbound Browser requests. This issue is fixed in version 1.11.1.",
  "id": "CVE-2026-84997",
  "modified": "2026-09-18T03:30:37.427709763Z",
  "published": "2026-09-16T14:07:52.948Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/reactphp/http/releases/tag/v1.11.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84997.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/reactphp/http/security/advisories/GHSA-x424-64qh-5j54"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84997"
    },
    {
      "type": "FIX",
      "url": "https://github.com/reactphp/http/commit/b6d4688790adf3797071fcf88a3fc4225f30486a"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "react/http: A malformed HTTP chunked body can lead to a denial-of-service and peg the CPU"
}