{"id":"CVE-2026-54282","state":"PUBLISHED","title":"Starlette: Unvalidated request path concatenated into authority poisons request.url.hostname","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.","publishedAt":"2026-06-22T16:45:01.629Z","updatedAt":"2026-06-22T17:26:58.637Z","severity":{"score":3.7,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["Kludex starlette"],"affected":[{"vendor":"Kludex","product":"starlette","versions":[{"version":"< 1.3.0","status":"affected"}]}],"references":["https://github.com/Kludex/starlette/security/advisories/GHSA-jp82-jpqv-5vv3"],"weaknesses":["CWE-706"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/54xxx/CVE-2026-54282.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-54282","state":"PUBLISHED","datePublished":"2026-06-22T16:45:01.629Z","dateUpdated":"2026-06-22T17:26:58.637Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-12T17:46:37.292Z"},"containers":{"cna":{"title":"Starlette: Unvalidated request path concatenated into authority poisons request.url.hostname","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Kludex","product":"starlette","versions":[{"version":"< 1.3.0","status":"affected"}]}],"references":[{"url":"https://github.com/Kludex/starlette/security/advisories/GHSA-jp82-jpqv-5vv3","name":"https://github.com/Kludex/starlette/security/advisories/GHSA-jp82-jpqv-5vv3","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-706","lang":"en","description":"CWE-706: Use of Incorrectly-Resolved Name or Reference","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-06-22T16:45:01.629Z"},"source":{"advisory":"GHSA-jp82-jpqv-5vv3","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-22T17:26:39.551031Z","id":"CVE-2026-54282","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-22T17:26:58.637Z"}}]}}}