Live › vulnerability › CVE-2026-74758
Go to dashboardA heap use-after-free in bRPC's RTMP support lets a remote attacker send a crafted RTMP Abort control message that deletes a chunk stream still in use. The result is a crash of the bRPC RTMP server, with no authentication needed.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Only servers built on bRPC that enable RTMP support by setting ServerOptions.rtmp_service and accept connections from untrusted networks are exposed. Servers without RTMP enabled, or those reachable only from trusted networks, can skip this.
No product ranges from the sources yet.
unknown for exact command, look at the dependency manifest or installed package for a version below 1.18.0ServerOptions.rtmp_service (RTMP enabled) and accepts traffic from untrusted networks1.18.0Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
A heap use-after-free in the RTMP protocol component of Apache bRPC (versions < 1.18.0) allows a remote attacker to crash a bRPC RTMP server by sending a crafted Abort control message. No authentication or application-level request is required.
Root Cause: When an RTMP Abort control message names the chunk stream that is currently being parsed (the chunk stream carrying the message itself), RtmpChunkStream::OnAbortMessage calls RtmpContext::ClearChunkStream, which deletes the RtmpChunkStream while its Feed() is still running. After the message handler returns, Feed() continues to access members of the deleted object, resulting in a heap-use-after-free.
Affected Scenarios: bRPC servers that enable RTMP support (ServerOptions.rtmp_service set) and accept connections from untrusted networks.
How to Fix:
The fix skips clearing the chunk stream when the Abort message targets the chunk stream that is currently being parsed.
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