{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.0",
  "cveMetadata": {
    "cveId": "CVE-2023-39326"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc"
      },
      "title": "Denial of service via chunk extensions in net/http",
      "descriptions": [
        {
          "lang": "en",
          "value": "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. A 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. Chunk 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": [
        {
          "vendor": "Go standard library",
          "product": "net/http/internal",
          "collectionURL": "https://pkg.go.dev",
          "packageName": "net/http/internal",
          "versions": [
            {
              "version": "0",
              "lessThan": "1.20.12",
              "status": "affected",
              "versionType": "semver"
            },
            {
              "version": "1.21.0-0",
              "lessThan": "1.21.5",
              "status": "affected",
              "versionType": "semver"
            }
          ],
          "programRoutines": [
            {
              "name": "chunkedReader.beginChunk"
            },
            {
              "name": "readChunkLine"
            },
            {
              "name": "chunkedReader.Read"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-400: Uncontrolled Resource Consumption"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://go.dev/issue/64433"
        },
        {
          "url": "https://go.dev/cl/547335"
        },
        {
          "url": "https://groups.google.com/g/golang-dev/c/6ypN5EjibjM/m/KmLVYH_uAgAJ"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2023-2382"
        },
        {
          "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UIU6HOGV6RRIKWM57LOXQA75BGZSIH6G/"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Bartek Nowotarski"
        }
      ]
    }
  }
}