# CVE-2026-86249: Apache bRPC: Authentication bypass when a server sets ServerOptions.internal_port and ServerOptions.auth


- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 21 Oct 2026
- **Updated:** 21 Oct 2026
- **Also known as:** GHSA-9hx3-v45m-g57x

## What is CVE-2026-86249?

CVE-2026-86249 is a vulnerability in Apache bRPC, published on 21 Oct 2026. 

### Official 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. 

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().

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-86249?


## How do I fix CVE-2026-86249?

No fix has been published for CVE-2026-86249 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-86249 being exploited?

There is no known exploitation of CVE-2026-86249 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-86249 and fix it if it is affected.

What it is: CVE-2026-86249 is a vulnerability in Apache bRPC, published on 21 Oct 2026. 
Exploitation: There is no known exploitation of CVE-2026-86249 in the wild and no public exploit code.

Affected product: Apache bRPC. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-86249/ (Markdown: https://insights.sbomify.com/CVE-2026-86249/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-86249
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-86249
- OSV: https://osv.dev/vulnerability/CVE-2026-86249

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-86249/
Summaries are generated and may contain mistakes; the official description above is the record.