Apache bRPC: Authentication bypass when a server sets ServerOptions.internal_port and ServerOptions.auth
CVSS score
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EPSS probability
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Risk score
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Published
4 h ago
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Vulnerability description
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
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Evidence confidence
%55
Short explanation
When Apache bRPC servers are configured with both ServerOptions.auth and ServerOptions.internal_port, the authentication mechanism can be entirely bypassed, allowing remote attackers to reach ordinary protected services.
Attackers can leverage initial connection exemptions to lock in a validated session state, granting subsequent requests access to protected services without supplying valid credentials.
What should be done?
- Upgrade to version 1.18.0
- Apply the referenced pull request patch
- Move normal services to the port passed to Server::Start()
Chain of evidence and sources
Apache bRPC sunucularında ServerOptions.auth ve ServerOptions.internal_port birlikte ayarlandığında kimlik doğrulama atlatılabilir.
Doğrulama sonucu bağlantıya kilitlenir ve sonrasındaki istekler kontrol edilmez.
Saldırganlar geçerli kimlik bilgileri sunmadan olağan servislere erişebilir.
Show the technical text from the sources
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().
CWE: CWE-287
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-86249 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | Apache Software Foundation | Apache bRPC | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-86249 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-86249 weaknesses.
Official Sources and Advisories
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Weakness Type (CWE & CAPEC)
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