Advisory [CVE-2026-82210] 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
This security Apache Software Foundation advisory covers CVE-2026-82210; related products: Apache bRPC.
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Summary
Enforceable assertion in the streaming feature of Apache bRPC (version 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:
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.
- Apache bRPC before 1.18.0
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
- 1.18.0
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
Mitigation checklist
- Upgrade bRPC to version 1.18.0, which fixes this issue.
- 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.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
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