{
  "schema_version": "1.3.1",
  "id": "GO-2023-2382",
  "modified": "0001-01-01T00:00:00Z",
  "published": "0001-01-01T00:00:00Z",
  "aliases": [
    "CVE-2023-39326"
  ],
  "summary": "Denial of service via chunk extensions in net/http",
  "details": "A malicious HTTP sender can use chunk extensions to cause a receiver reading from a request or response body to read many more bytes from the network than are in the body.\n\nA malicious HTTP client can further exploit this to cause a server to automatically read a large amount of data (up to about 1GiB) when a handler fails to read the entire body of a request.\n\nChunk extensions are a little-used HTTP feature which permit including additional metadata in a request or response body sent using the chunked encoding. The net/http chunked encoding reader discards this metadata. A sender can exploit this by inserting a large metadata segment with each byte transferred. The chunk reader now produces an error if the ratio of real body to encoded bytes grows too small.",
  "affected": [
    {
      "package": {
        "name": "stdlib",
        "ecosystem": "Go"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.20.12"
            },
            {
              "introduced": "1.21.0-0"
            },
            {
              "fixed": "1.21.5"
            }
          ]
        }
      ],
      "ecosystem_specific": {
        "imports": [
          {
            "path": "net/http/internal",
            "symbols": [
              "chunkedReader.Read",
              "chunkedReader.beginChunk",
              "readChunkLine"
            ]
          }
        ]
      }
    }
  ],
  "references": [
    {
      "type": "REPORT",
      "url": "https://go.dev/issue/64433"
    },
    {
      "type": "FIX",
      "url": "https://go.dev/cl/547335"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/golang-dev/c/6ypN5EjibjM/m/KmLVYH_uAgAJ"
    }
  ],
  "credits": [
    {
      "name": "Bartek Nowotarski"
    }
  ],
  "database_specific": {
    "url": "https://pkg.go.dev/vuln/GO-2023-2382"
  }
}