low3.7
CVE-2026-54282
Starlette: Unvalidated request path concatenated into authority poisons request.url.hostname
Impact
Starlette is a lightweight ASGI framework/toolkit. Prior to 1.3.0, the HTTP request path is not validated before being used to reconstruct request.url. Because request.url is rebuilt by concatenating {scheme}://{host}{path} and re-parsing the result, a path that does not begin with / (for example @google.com) moves the authority boundary during re-parsing, so request.url.hostname and request.url.netloc become attacker-controlled. Code that reads request.url.hostname (rather than the Host header or scope) can therefore be misled into trusting an attacker-supplied host. This vulnerability is fixed in 1.3.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | Starlette | < 1.3.0 | 1.3.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Encode | Starlette | before 1.3.0 |