---
id: "CVE-2026-48830"
kind: "vulnerability"
aliases: ["CVE-2026-48830"]
title: "Apache bRPC: keep-alive connection bypasses authentication on HTTP endpoints"
severity: "high"
cvss: null
epss: 0.00263
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["bliss", "brpc", "c++", "runtime", "self-hosted"]
not_affected_if: ["builtin-services-private", "default-config"]
published_at: "2026-10-21T12:17:20+00:00"
first_seen_at: "2026-10-23T21:57:28+00:00"
updated_at: "2026-10-25T05:02:54+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48830", "first_seen_at": "2026-10-23T21:57:28+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-48830", "first_seen_at": "2026-10-24T13:15:54+00:00"}]
---

# Apache bRPC: keep-alive connection bypasses authentication on HTTP endpoints

Apache bRPC through 1.17.0 lets an unauthenticated remote client skip authentication on protected non-builtin HTTP endpoints. The bypass works by first sending a builtin HTTP request on the same HTTP/1.1 keep-alive connection, which marks the socket as authenticated for later requests.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the bRPC version in use; affected versions are `1.17.0` and earlier.
- Look for `ServerOptions.auth` being set while builtin HTTP services are reachable on the public listener.

## Fix

- Upgrade Apache bRPC to `1.18.0`.
- If upgrading is not possible, apply the patch from https://github.com/apache/brpc/pull/3308 separately.

## Timeline

- 2026-10-23T21:57:28+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-48830
- 2026-10-24T13:15:54+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-48830

## From the sources

Improper authentication in Apache bRPC through 1.17.0 allows a remote unauthenticated attacker to bypass authentication for protected non-builtin HTTP endpoints by first sending a builtin HTTP request on the same HTTP/1.1 keep-alive connection.

When ServerOptions.auth is enabled and builtin HTTP services are exposed on the public listener, a builtin request received as the first message on a socket may cause the connection to be treated as authenticated for later requests on that socket. Users are recommended to upgrade to version 1.18.0, which fixes this issue, or apply this PR separately:  https://github.com/apache/brpc/pull/3308

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_