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      <title>CVE-2026-74758 — Apache bRPC: Heap Use-After-Free in RTMP Abort Message Handling</title>
      <link>https://db.gcve.eu/vuln/cve-2026-74758</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Apache Software Foundation Apache bRPC&lt;/p&gt;
&lt;p&gt;A heap use-after-free in the RTMP protocol component of Apache bRPC (versions &amp;lt; 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.&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;Affected Scenarios:
bRPC servers that enable RTMP support (ServerOptions.rtmp_service set) and accept connections from untrusted networks.&lt;/p&gt;
&lt;p&gt;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&lt;/p&gt;
&lt;p&gt;The fix skips clearing the chunk stream when the Abort message targets the chunk stream that is currently being parsed.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Apache Software Foundation Apache bRPC&lt;/p&gt;
&lt;p&gt;A heap use-after-free in the RTMP protocol component of Apache bRPC (versions &amp;lt; 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.&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;Affected Scenarios:
bRPC servers that enable RTMP support (ServerOptions.rtmp_service set) and accept connections from untrusted networks.&lt;/p&gt;
&lt;p&gt;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&lt;/p&gt;
&lt;p&gt;The fix skips clearing the chunk stream when the Abort message targets the chunk stream that is currently being parsed.&lt;/p&gt;</content:encoded>
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