{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.17.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9523e1ec8c41fde265a26d14563d178b6f1ad04b"
            },
            {
              "fixed": "feb692f552e3ed4533cf4e3af4809908d84cd763"
            }
          ],
          "repo": "https://github.com/scrapy/scrapy",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-76g3-c3x4-crvx"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-319"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84366.json"
  },
  "details": "Scrapy is a high-level web crawling and scraping framework for Python. Prior to 2.17.0, in scrapy/core/downloader/handlers/s3.py, Scrapy's S3DownloadHandler converts an S3-scheme bucket and key request into a plaintext HTTP request to the corresponding S3 endpoint unless request.meta[\"is_secure\"] is explicitly enabled, then signs and sends the plaintext request with configured AWS credentials. A network attacker who can observe traffic between Scrapy and S3 can read the bucket and key path, AWS Authorization header, X-Amz-Security-Token when temporary credentials are used, S3 object contents, and S3 response headers. An active man-in-the-middle attacker can also modify the plaintext S3 response body, status code, and headers before Scrapy processes them, causing scraped-data poisoning, poisoned exports, HTTP cache poisoning when caching is enabled, or influence over later crawl targets through forged redirects or attacker-controlled links. Users making S3-scheme requests with AWS credentials are affected. This issue is fixed in version 2.17.0.",
  "id": "CVE-2026-84366",
  "modified": "2026-09-03T03:30:35.916222834Z",
  "published": "2026-09-01T20:29:23.143Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/scrapy/scrapy/releases/tag/2.17.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84366.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/scrapy/scrapy/security/advisories/GHSA-76g3-c3x4-crvx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84366"
    },
    {
      "type": "FIX",
      "url": "https://github.com/scrapy/scrapy/commit/9523e1ec8c41fde265a26d14563d178b6f1ad04b"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Scrapy: S3DownloadHandler sends signed S3 requests over plaintext HTTP by default"
}