CVE-2026-82953 Apache bRPC: NULL Pointer Dereference in RTMP createStream Error Path Leading to Remote Denial of Service
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-82953?
CVE-2026-82953 is a medium-severity vulnerability in Apache bRPC, published on 21 Oct 2026.
Official description
NULL pointer dereference in the RTMP protocol implementation in Apache bRPC (version < 1.18.0) on all platforms allows remote attackers to crash the server (denial of service) via a crafted createStream command.
Root Cause: When an RTMP service rejects a createStream request by returning a null stream from RtmpService::NewStream(), the server sends an error response to the client. If writing this rejection response fails (for example, because the client closes the connection immediately after sending the createStream command), the error-handling path in RtmpChunkStream::OnCreateStream() dereferences the null stream pointer to access stream->_onfail_id, causing the process to crash.
Affected Scenarios: Run an Apache bRPC RTMP server whose RtmpService::NewStream() may return null (i.e., the service rejects createStream requests). A remote client that sends a createStream command and then closes the connection before the rejection response is written can crash the server.
How to Fix: (Choose one of the following options) 1. Upgrade bRPC to version 1.18.0, which fixes this issue. 2. Apply this patch: https://github.com/apache/brpc/pull/3508
Weakness: CWE-476
Which versions are affected by CVE-2026-82953?
How do I fix CVE-2026-82953?
No fix has been published for CVE-2026-82953 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-82953 being exploited?
There is no known exploitation of CVE-2026-82953 in the wild and no public exploit code.
Sources
Also known as GHSA-389h-hr53-4f3g.