{"id":"CVE-2026-55641","state":"PUBLISHED","title":"9router: Unauthenticated `/v1` proxy access via `Host`-header spoofing → open AI relay + SSRF","description":"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.","publishedAt":"2026-07-10T15:36:05.964Z","updatedAt":"2026-07-10T19:06:14.379Z","severity":{"score":8.2,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["decolua 9router"],"affected":[{"vendor":"decolua","product":"9router","versions":[{"version":"< 0.5.2","status":"affected"}]}],"references":["https://github.com/decolua/9router/security/advisories/GHSA-86m2-fcxq-5q7c","https://github.com/decolua/9router/commit/b282f0554972ea35281520738759d76abcd0b0b3","https://github.com/decolua/9router/releases/tag/v0.5.2"],"weaknesses":["CWE-290","CWE-348","CWE-918","CWE-1327"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55641.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55641","state":"PUBLISHED","datePublished":"2026-07-10T15:36:05.964Z","dateUpdated":"2026-07-10T19:06:14.379Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-16T23:52:12.057Z"},"containers":{"cna":{"title":"9router: Unauthenticated `/v1` proxy access via `Host`-header spoofing → open AI relay + SSRF","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"decolua","product":"9router","versions":[{"version":"< 0.5.2","status":"affected"}]}],"references":[{"url":"https://github.com/decolua/9router/security/advisories/GHSA-86m2-fcxq-5q7c","name":"https://github.com/decolua/9router/security/advisories/GHSA-86m2-fcxq-5q7c","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/decolua/9router/commit/b282f0554972ea35281520738759d76abcd0b0b3","name":"https://github.com/decolua/9router/commit/b282f0554972ea35281520738759d76abcd0b0b3","tags":["x_refsource_MISC"]},{"url":"https://github.com/decolua/9router/releases/tag/v0.5.2","name":"https://github.com/decolua/9router/releases/tag/v0.5.2","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-290","lang":"en","description":"CWE-290: Authentication Bypass by Spoofing","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-348","lang":"en","description":"CWE-348: Use of Less Trusted Source","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-1327","lang":"en","description":"CWE-1327: Binding to an Unrestricted IP Address","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-10T15:36:05.964Z"},"source":{"advisory":"GHSA-86m2-fcxq-5q7c","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/decolua/9router/security/advisories/GHSA-86m2-fcxq-5q7c","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-10T19:06:04.625545Z","id":"CVE-2026-55641","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-10T19:06:14.379Z"}}]}}}