{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-48710", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-05-22T18:47:27.755Z", "datePublished": "2026-05-26T21:54:54.393Z", "dateUpdated": "2026-05-26T21:54:54.393Z"}, "containers": {"cna": {"title": "Starlette has missing Host header validation that poisons request.url.path, bypassing path-based security checks", "problemTypes": [{"descriptions": [{"cweId": "CWE-444", "lang": "en", "description": "CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr"}, {"name": "https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6", "tags": ["x_refsource_MISC"], "url": "https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6"}, {"name": "https://badhost.org", "tags": ["x_refsource_MISC"], "url": "https://badhost.org"}, {"name": "https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml", "tags": ["x_refsource_MISC"], "url": "https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml"}, {"name": "https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette", "tags": ["x_refsource_MISC"], "url": "https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette"}, {"name": "https://www.secwest.net/starlette", "tags": ["x_refsource_MISC"], "url": "https://www.secwest.net/starlette"}, {"name": "https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette", "tags": ["x_refsource_MISC"], "url": "https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette"}], "affected": [{"vendor": "Kludex", "product": "starlette", "versions": [{"version": "< 1.0.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-26T21:54:54.393Z"}, "descriptions": [{"lang": "en", "value": "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 \u00a73.2 / RFC 3986 \u00a73.2.2 when constructing `request.url` and falls back to `scope[\"server\"]` for malformed values."}], "source": {"advisory": "GHSA-86qp-5c8j-p5mr", "discovery": "UNKNOWN"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "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 \u00a73.2 / RFC 3986 \u00a73.2.2 when constructing `request.url` and falls back to `scope[\"server\"]` for malformed values."}], "id": "CVE-2026-48710", "lastModified": "2026-05-26T22:16:44.020", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-05-26T22:16:44.020", "references": [{"source": "security-advisories@github.com", "url": "https://badhost.org"}, {"source": "security-advisories@github.com", "url": "https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6"}, {"source": "security-advisories@github.com", "url": "https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr"}, {"source": "security-advisories@github.com", "url": "https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml"}, {"source": "security-advisories@github.com", "url": "https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette"}, {"source": "security-advisories@github.com", "url": "https://www.secwest.net/starlette"}, {"source": "security-advisories@github.com", "url": "https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-444"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"created": "2026-05-27T00:00:16.819747+00:00", "updated": "2026-05-27T00:00:16.819776+00:00", "vendors": []}