CVE-2026-84366

6th percentile - higher than 6% of all known CVEs

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.

The vulnerability can lead to leakage of sensitive data (including AWS credentials) and poisoning of scraped data, which can affect the integrity of processed information and overall system security.

It is recommended to update Scrapy to version 2.17.0, which contains the fix. Also, ensure that S3 requests are made over secure connections (HTTPS) and avoid sending credentials over unsecured networks.