Is there a public exploit for CVE-2026-54282?

No public exploit for CVE-2026-54282 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-54282?

CVE-2026-54282 scores CVSS 5.3 (v3.1), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.27%.

What does CVE-2026-54282 affect?

CVE-2026-54282 affects Kludex Starlette.

5.3 Medium

Starlette is a lightweight ASGI framework/toolkit.

CVE-2026-54282

Summary In affected versions, 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. Details When a client requests a path that does not start with /: http GET @google.com HTTP/1.1 Host: localhost affected versions reconstruct the URL as http://localhost@google.com. Per [RFC 3986 §3.2.1](https://www.rfc-editor.org/rfc/rfc3986.html#section-3.2.1), the substring before @ in the authority is userinfo, so re-parsing yields username = "localhost" and hostname = "google.com", with an empty path: text request.url == "http://localhost@google.com" request.url.hostname == "google.com" request.url.path == "" The root cause is that the path is concatenated directly after the host without a separating /, and without validating that it begins with…

Assessment

CVSS: 5.3 (v3.1)
Severity: Medium
EPSS: 0.27% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 15 June 2026
Last updated: 25 October 2026
Affected: Kludex · starlette · Starlette
Weakness: CWE-20, CWE-706
Assigner: security-advisories@github.com

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

At the source

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