---
id: CVE-2026-82210
title: >-
  Apache bRPC: Remote denial of service (crash) via malformed stream feedback
  frames
summary: >-
  Enforceable assertion in the streaming feature of Apache bRPC (version <
  1.18.0) on all platforms allows a remote attacker to crash the server process
  by sending a malformed stream feedback frame.


  Root Cause:

  When handling FRAME_TYPE_FE…
severity: none
cwe:
  - CWE-617
vendor: Apache Software Foundation
product: apache/brpc
affected:
  - apache/brpc < 1.18.0
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:01:31.264Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-82210'
references:
  - url: 'https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb'
tags:
  - cve.org
ingestedAt: '2026-10-21T12:48:53.759Z'
---

## Overview

Enforceable assertion in the streaming feature of Apache bRPC (version < 1.18.0) on all platforms allows a remote attacker to crash the server process by sending a malformed stream feedback frame.

Root Cause:
When handling FRAME_TYPE_FEEDBACK frames, bRPC calls Stream::SetRemoteConsumed() which contains CHECK(_cur_buf_size > 0) and unconditionally asserts CHECK(buf.IsEmpty()) on the frame payload. A feedback frame that carries an unexpected payload, or a feedback frame received on a stream where flow control is disabled (cur_buf_size == 0), reaches these assertions. On failure, CHECK failures abort the process, allowing an unauthenticated single client (once a stream is established) to terminate the server and cause a denial of service.

Affected Scenarios:
Use bRPC server with the streaming control feature (Stream API) served from untrusted network.

How to Fix:
1. Upgrade bRPC to version 1.18.0, which fixes this issue.
2. Apply this patch:  https://github.com/apache/brpc/pull/3494 

The fix rejects malformed feedback frames with EPROTO and closes only the affected stream instead of crashing the whole process, and it bounds buffer shrinking so cur_buf_size never drops to 0 while flow control is enabled.

## Affected

- `apache/brpc < 1.18.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.