{"id":"CVE-2026-55641","summary":"9router: Unauthenticated `/v1` proxy access via `Host`-header spoofing → open AI relay + SSRF","details":"9Router is an AI router & token saver. Prior to 0.5.2, 9router determines whether a /v1 LLM proxy request is local by reading the client-controlled Host header, allowing a remote unauthenticated attacker to send Host: localhost and bypass API-key authentication. In the default configuration, this exposes the /v1 proxy to upstream provider calls using stored provider credentials and allows /v1/search with the searxng provider_options.baseUrl parameter to drive server-side requests to internal or cloud-metadata hosts. This issue is fixed in version 0.5.2.","aliases":["GHSA-86m2-fcxq-5q7c"],"modified":"2026-08-12T03:51:12.348487734Z","published":"2026-07-10T15:36:05.964Z","database_specific":{"cwe_ids":["CWE-1327","CWE-290","CWE-348","CWE-918"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55641.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/decolua/9router/releases/tag/v0.5.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55641.json"},{"type":"ADVISORY","url":"https://github.com/decolua/9router/security/advisories/GHSA-86m2-fcxq-5q7c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55641"},{"type":"FIX","url":"https://github.com/decolua/9router/commit/b282f0554972ea35281520738759d76abcd0b0b3"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/decolua/9router","events":[{"introduced":"0"},{"fixed":"b282f0554972ea35281520738759d76abcd0b0b3"},{"fixed":"5da508af3c3dc6e920286141d1a4ddcd4ec245db"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"0.5.2"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v0.4.80","v0.4.71","v0.4.66","v0.4.63","v0.4.62","v0.4.59","v0.4.58","v0.4.55","v0.4.52","v0.4.50","v0.4.49","v0.4.46","v0.4.44","v0.4.41","v0.4.39","v0.4.38","v0.4.37","v0.4.36","v0.4.33","v0.4.31","v0.4.30","v0.4.29","v0.4.28","v0.4.27","v0.4.25","v0.4.20","v0.4.19","v0.4.18","v0.4.16","v0.4.14","v0.4.13","v0.4.12","v0.4.11","v0.4.10","v0.4.8","v0.4.6","v0.4.4","v0.4.3","v0.4.2","v0.4.1","v0.3.98","v0.3.97","v0.3.91","v0.3.90","v0.3.89","v0.3.87","v0.3.86","v0.3.83","v0.3.75","v0.3.47","v0.3.42","v0.3.34","v0.3.17","v0.2.89","v0.2.79","v0.2.71","v0.2.70","v0.2.67","v0.2.56","v0.2.52","v0.2.43","v0.2.36","v0.2.31","v0.2.27","v0.2.21"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55641.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N"}]}