{"id":"CVE-2026-48710","revision":null,"records":[{"revision":"07bb58395b7043119c313dc9a46d5b28","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-48710","aliases":[],"title":"Starlette has missing Host header validation that poisons request.url.path, bypassing path-based security checks","description":"Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP `Host` request header was not validated before being used to reconstruct `request.url`. Because the routing algorithm relies on the raw HTTP path while `request.url` is rebuilt from the `Host` header, a malformed header could make `request.url.path` differ from the path that was actually requested. Middleware and endpoints that apply security restrictions based on `request.url` (rather than the raw `scope` path) could therefore be bypassed. Users should upgrade to a version greater than or equal to version 1.0.1, which validates the `Host` header against the grammar of RFC 9112 §3.2 / RFC 3986 §3.2.2 when constructing `request.url` and falls back to `scope[\"server\"]` for malformed values.","state":0,"publishedAt":"2026-05-26T21:54:54.393+00:00","modifiedAt":"2026-10-01T17:41:26.242+00:00","affected":[{"ecosystem":"Vendor product","name":"starlette","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Kludex\",\n                    \"product\": \"starlette\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.0.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr","https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6","https://badhost.org/","https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml","https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette","https://www.secwest.net/starlette","https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-48710","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-48710","identifiers":["CVE-2026-48710"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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