{"id":"CVE-2026-55641","title":"9Router is an AI router & token saver","summary":"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 bypas…","severity":"high","cvss":8.2,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","cwe":["CWE-290","CWE-348","CWE-918","CWE-1327"],"published":"2026-07-10","updated":"2026-07-10","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55641","references":[{"url":"https://github.com/decolua/9router/commit/b282f0554972ea35281520738759d76abcd0b0b3","label":"security-advisories@github.com"},{"url":"https://github.com/decolua/9router/releases/tag/v0.5.2","label":"security-advisories@github.com"},{"url":"https://github.com/decolua/9router/security/advisories/GHSA-86m2-fcxq-5q7c","label":"security-advisories@github.com"},{"url":"https://github.com/decolua/9router/security/advisories/GHSA-86m2-fcxq-5q7c","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00323,"epssPercentile":0.25438,"ingestedAt":"2026-07-11T20:15:26.081Z","slug":"CVE-2026-55641","body":"## Overview\n\n9Router 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}