Vulnerability 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.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Encode | Starlette | < 1.3.0 |
Related Weaknesses (CWE)
References
- https://github.com/Kludex/starlette/security/advisories/GHSA-jp82-jpqv-5vv3MitigationVendor Advisory
FAQ
What is CVE-2026-54282?
CVE-2026-54282 is a vulnerability with a CVSS score of 3.7 (LOW). 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 ...
How severe is CVE-2026-54282?
CVE-2026-54282 has been rated LOW with a CVSS base score of 3.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-54282?
Check the references section above for vendor advisories and patch information. Affected products include: Encode Starlette.