{"id":"CVE-2021-41125","aliases":["GHSA-jwqp-28gf-p498","PYSEC-2021-363"],"url":"https://o3.security/vulnerability/CVE-2021-41125","summary":"Scrapy HTTP authentication credentials potentially leaked to target websites ","details":"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`.","published":"2021-10-06T18:15:10.953Z","modified":"2026-07-08T06:26:55.446938082Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"},"epss":{"score":0.01251,"percentile":0.66656,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"scrapy","fixedVersion":"1.8.1"},{"ecosystem":"PyPI","name":"scrapy","fixedVersion":"2.5.1"}],"fix":{"url":"https://github.com/scrapy/scrapy/commit/b01d69a1bf48060daec8f751368622352d8b85a6","label":"scrapy/scrapy@b01d69a"},"references":[{"type":"ADVISORY","url":"http://doc.scrapy.org/en/latest/topics/downloader-middleware.html#module-scrapy.downloadermiddlewares.httpauth"},{"type":"ADVISORY","url":"https://github.com/scrapy/scrapy/security/advisories/GHSA-jwqp-28gf-p498"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2022/03/msg00021.html"},{"type":"ADVISORY","url":"https://w3lib.readthedocs.io/en/latest/w3lib.html#w3lib.http.basic_auth_header"},{"type":"FIX","url":"https://github.com/scrapy/scrapy/commit/b01d69a1bf48060daec8f751368622352d8b85a6"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T06:26:55.446938082Z"}}