CVE-2026-86249

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. Mitigation / Fix: upgrade to 1.18.0 or apply PR https://github.com/apache/brpc/pull/3525 . Users who rely on serving normal services on internal_port must move those requests to the port passed to Server::Start().

CVSS v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/apache/brpc/pulls/3525
https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb

Configurations

No configuration.

History

30 Oct 2026, 17:17

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.1

21 Oct 2026, 13:20

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-21 13:20

Updated : 2026-10-30 17:17

NVD link : CVE-2026-86249

Mitre link : CVE-2026-86249

CVE.ORG link : CVE-2026-86249

JSON object : View

Products Affected

No product.

CWE

CWE-287

Improper Authentication

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