Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-54282

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 8.5%
CVSS Severity
CVSS v3 Score 3.7
Products affected by CVE-2026-54282


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