CVE-2021-41125

Scrapy is a high-level web crawling and scraping framework for Python. If you use `HttpAuthMiddleware` (i.e. the `http_user` and `http_pass` spider attributes) for HTTP authentication, all requests will expose your credentials to the request target. This includes requests generated by Scrapy components, such as `robots.txt` requests sent by Scrapy when the `ROBOTSTXT_OBEY` setting is set to `True`, or as requests reached through redirects. Upgrade to Scrapy 2.5.1 and use the new `http_auth_domain` spider attribute to control which domains are allowed to receive the configured HTTP authentication credentials. If you are using Scrapy 1.8 or a lower version, and upgrading to Scrapy 2.5.1 is not an option, you may upgrade to Scrapy 1.8.1 instead. If you cannot upgrade, set your HTTP authentication credentials on a per-request basis, using for example the `w3lib.http.basic_auth_header` function to convert your credentials into a value that you can assign to the `Authorization` header of your request, instead of defining your credentials globally using `HttpAuthMiddleware`.

• CWE-200
• CWE-522

• http://doc.scrapy.org/en/latest/topics/downloader-middleware.html#module-scrapy.downloadermiddlewares.httpauthVendor Advisory
• https://github.com/scrapy/scrapy/commit/b01d69a1bf48060daec8f751368622352d8b85a6Patch, Third Party Advisory
• https://github.com/scrapy/scrapy/security/advisories/GHSA-jwqp-28gf-p498Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/03/msg00021.htmlMailing List, Third Party Advisory
• https://w3lib.readthedocs.io/en/latest/w3lib.html#w3lib.http.basic_auth_headerThird Party Advisory
• http://doc.scrapy.org/en/latest/topics/downloader-middleware.html#module-scrapy.downloadermiddlewares.httpauthVendor Advisory
• https://github.com/scrapy/scrapy/commit/b01d69a1bf48060daec8f751368622352d8b85a6Patch, Third Party Advisory
• https://github.com/scrapy/scrapy/security/advisories/GHSA-jwqp-28gf-p498Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/03/msg00021.htmlMailing List, Third Party Advisory
• https://w3lib.readthedocs.io/en/latest/w3lib.html#w3lib.http.basic_auth_headerThird Party Advisory

Published

Oct 6, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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