CVE-2026-54282
Starlette: Unvalidated request path concatenated into authority poisons request.url.hostname
Description
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.
INFO
Published Date :
June 22, 2026, 4:45 p.m.
Last Modified :
June 22, 2026, 4:45 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-54282
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update Starlette to version 1.3.0 or later.
- Validate request path handling in your application.
- Avoid trusting request.url.hostname directly.
- Prefer using Host header or scope data.
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