CVE-2026-74758
Apache bRPC: Heap Use-After-Free in RTMP Abort Message Handling
- State
- Published
- Severity
- 7.5 High
- Published
- Oct 21, 2026
- Updated
- Oct 30, 2026
- Reserved
- Aug 15, 2026
Description
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: 1. Upgrade bRPC to version 1.18.0, which fixes this issue. 2. Apply this patch: https://github.com/apache/brpc/pull/3452
The fix skips clearing the chunk stream when the Abort message targets the chunk stream that is currently being parsed.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CISA-ADP |
Weaknesses
- CWE-416 Use After Free
Affected Products
| Product | Versions |
|---|---|
Apache bRPCApache Software Foundation |
|
References
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