CVE-2026-82953 Apache Software Foundation CVE debrief

Who should care

Defenders of Apache bRPC RTMP servers, network administrators, and security teams should assess exposure and prioritize upgrading to version 1.18.0 or applying patch to prevent server crashes. They should also verify the RTMP service configuration and client connections to prevent server crashes. Additionally, defenders should review compensating controls for exposed systems while remediation is scheduled and verified, and check relevant monitoring, and

Why it matters

Apache bRPC RTMP server is vulnerable to remote denial of service due to NULL pointer dereference in createStream error path. Defenders should prioritize upgrading to version 1.18.0 or applying patch to prevent server crashes.

• Remote denial of service via crafted createStream command
• Server crash due to NULL pointer dereference
• Potential disruption of RTMP services
• Verification of RTMP service configuration and client connections required

Technical summary

Apache bRPC RTMP server crashes with denial of service due to NULL pointer dereference in createStream error path when client closes connection before rejection response is written. The vulnerability occurs in the RTMP protocol implementation in Apache bRPC (version < 1.18.0) on all platforms. A remote attacker can crash the server via a crafted createStream command. The root cause is that 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, the error-handling path in RtmpChunkStream::OnCreateStream() dereferences the null stream pointer, causing the process to

Defensive priority

Upgrade to version 1.18.0 or apply patch to prevent remote denial of service

Recommended defensive actions

• Upgrade Apache bRPC to version 1.18.0
• Apply patch from https://github.com/apache/brpc/pull/3508
• Verify RTMP service configuration and client connections
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

Official CVE Program record and NVD vulnerability detail provide information on NULL pointer dereference in Apache bRPC RTMP server. The CVE record was published on 2026-10-21T12:10:07.391Z and has not been modified since then. The vulnerability has a CVSS score and severity that are currently null. The affected product is Apache bRPC, and the vulnerability affects versions prior to 1.18.0. Defenders should verify the RTMP service configuration and client connections to prevent server crashes.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.