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| Vulnerability ID | VCID-2x5e-t4dd-9fba |
| Aliases |
GHSA-9x8m-2xpf-crp3
|
| Summary | Scrapy before 2.6.2 and 1.8.3 vulnerable to one proxy sending credentials to another ### Impact When the [built-in HTTP proxy downloader middleware](https://docs.scrapy.org/en/2.6/topics/downloader-middleware.html#module-scrapy.downloadermiddlewares.httpproxy) processes a request with `proxy` metadata, and that `proxy` metadata includes proxy credentials, the built-in HTTP proxy downloader middleware sets the `Proxy-Authentication` header, but only if that header is not already set. There are third-party proxy-rotation downloader middlewares that set different `proxy` metadata every time they process a request. Because of request retries and redirects, the same request can be processed by downloader middlewares more than once, including both the built-in HTTP proxy downloader middleware and any third-party proxy-rotation downloader middleware. These third-party proxy-rotation downloader middlewares could change the `proxy` metadata of a request to a new value, but fail to remove the `Proxy-Authentication` header from the previous value of the `proxy` metadata, causing the credentials of one proxy to be leaked to a different proxy. If you rotate proxies from different proxy providers, and any of those proxies requires credentials, you are affected, unless you are handling proxy rotation as described under **Workarounds** below. If you use a third-party downloader middleware for proxy rotation, the same applies to that downloader middleware, and installing a patched version of Scrapy may not be enough; patching that downloader middlware may be necessary as well. ### Patches Upgrade to Scrapy 2.6.2. If you are using Scrapy 1.8 or a lower version, and upgrading to Scrapy 2.6.2 is not an option, you may upgrade to Scrapy 1.8.3 instead. ### Workarounds If you cannot upgrade, make sure that any code that changes the value of the `proxy` request meta also removes the `Proxy-Authorization` header from the request if present. ### For more information If you have any questions or comments about this advisory: * [Open an issue](https://github.com/scrapy/scrapy/issues) * [Email us](mailto:opensource@zyte.com) |
| Status | Published |
| Exploitability | None |
| Weighted Severity | None |
| Risk | None |
| Affected and Fixed Packages | Package Details |
| There are no known CWE. |
| System | Score | Found at |
|---|---|---|
| cvssv3.1_qr | MODERATE | https://github.com/advisories/GHSA-9x8m-2xpf-crp3 |
| generic_textual | MODERATE | https://github.com/scrapy/scrapy |
| generic_textual | MODERATE | https://github.com/scrapy/scrapy/commit/af7dd16d8ded3e6cb2946603688f4f4a5212e80f |
| cvssv3.1_qr | MODERATE | https://github.com/scrapy/scrapy/security/advisories/GHSA-9x8m-2xpf-crp3 |
| generic_textual | MODERATE | https://github.com/scrapy/scrapy/security/advisories/GHSA-9x8m-2xpf-crp3 |
No EPSS data available for this vulnerability.
| Date | Actor | Action | Source | VulnerableCode Version |
|---|---|---|---|---|
| 2026-05-29T09:31:02.909848+00:00 | GithubOSV Importer | Import | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/07/GHSA-9x8m-2xpf-crp3/GHSA-9x8m-2xpf-crp3.json | 38.6.0 |