{"id":"CVE-2026-86249","published":"2026-10-21T13:20:04.470","lastModified":"2026-10-22T16:56:37.023","description":"On a brpc::Server that sets both ServerOptions.auth and ServerOptions.internal_port, the HTTP built-in service exemption on internal_port can be abused to bypass authentication entirely. VerifyHttpRequest() returns true without checking any credential when a built-in service is requested on internal_port, and this verdict is not per - request: verification runs only for the first message of a connection and the result latches the connection. Sending a request such as GET /status to internal_port first authenticates the whole connection, after which every subsequent request dispatched on the same connection is handled without ever calling VerifyHttpRequest(). This lets a remote attacker reach ordinary (non-built-in, non-tabbed) authenticated services without supplying valid credentials whenever the server uses ServerOptions.internal_port together with an Authenticator. The fix restricts internal_port so that it carries only built-in and Tabbed services; requests for ordinary services sent to internal_port are rejected with EPREM / HTTP 403. \n\n\n\nMitigation / Fix: upgrade to 1.18.0 or apply PR https://github.com/apache/brpc/pull/3525 . \n\n\n\nUsers who rely on serving normal services on internal_port must move those requests to the port passed to Server::Start().","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":["CWE-287"],"vendors":[],"products":[],"references":[{"url":"https://github.com/apache/brpc/pulls/3525","tags":[]},{"url":"https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb","tags":[]}],"exploitRefs":[{"url":"https://github.com/apache/brpc/pulls/3525","tags":[]}],"hasPoc":true,"ai":null}