# CVE-2026-82953: Apache bRPC NULL pointer dereference in RTMP createStream

Source: https://junglewise.ai/threats/cve-2026-82953-null-pointer-dereference-in-the-rtmp-protocol-implementation-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-21. Updated: 2026-10-21  
License: CC BY 4.0 with a link back

CVE-2026-82953 · Severity: info · Published 2026-10-21

Apache bRPC is an open-source RPC framework that supports the RTMP protocol for streaming. A remote attacker can crash an RTMP server by sending a createStream request and immediately closing the connection, causing a NULL pointer dereference in the error-handling code and denying service to legitimate users.

Technologies: [Apache Brpc](https://junglewise.ai/threats/technologies/brpc). Vendors: [Apache](https://junglewise.ai/threats/vendors/apache).

## Quick answers

**Is CVE-2026-82953 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-82953 being exploited in the wild.

**How severe is CVE-2026-82953?** Informational severity, published 21 October 2026.

**Which products and versions are affected?** Apache Brpc < 1.18.0.

**Is there a fix for CVE-2026-82953?** Yes: fixed in 1.18.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-82953 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-82953?** Check whether you run Apache Brpc at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 1.18.0

## Technical details

The vulnerability is a NULL pointer dereference in RtmpChunkStream::OnCreateStream() that occurs when RtmpService::NewStream() returns null (rejecting the stream) and the subsequent error response write fails. The error path attempts to access stream->_onfail_id on the null pointer, causing a crash. An attacker needs network access to the RTMP service and can trigger this by sending a crafted createStream command followed by an immediate disconnection.

## Affected products

- Apache bRPC < 1.18.0

## Timeline

- 2026-10-21: disclosed
- 2026-09-03: patched: PR #3508 merged to master

## References

- [https://github.com/](https://github.com/)
- [https://github.com/apache/brpc/pull/3508](https://github.com/apache/brpc/pull/3508)

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