{"id":"UBUNTU-CVE-2026-54282","details":"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.","modified":"2026-06-29T13:55:05.139843978Z","published":"2026-06-22T18:16:00Z","upstream":["CVE-2026-54282"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-54282"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-54282"},{"type":"REPORT","url":"https://github.com/Kludex/starlette/security/advisories/GHSA-jp82-jpqv-5vv3"},{"type":"REPORT","url":"https://github.com/Kludex/starlette/pull/3326"}],"affected":[{"package":{"name":"starlette","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/starlette?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.14.1-1","0.16.0-1","0.18.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-starlette","binary_version":"0.18.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54282.json"}},{"package":{"name":"starlette","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/starlette?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.30.0-1","0.31.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-starlette","binary_version":"0.31.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54282.json"}},{"package":{"name":"starlette","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/starlette?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.46.1-2","0.46.1-3"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-starlette","binary_version":"0.46.1-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54282.json"}},{"package":{"name":"starlette","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/starlette?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.46.1-3","0.50.0-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.50.0-1","binary_name":"python3-starlette"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54282.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}