CVE-2026-74758: CWE-416 Use After Free in Apache Software Foundation Apache bRPC
Description
CVE-2026-74758 is a heap use-after-free vulnerability in the RTMP protocol component of Apache bRPC versions prior to 1.18.0. It allows a remote attacker to crash a bRPC RTMP server by sending a specially crafted Abort control message without requiring authentication. The issue arises because the server deletes a chunk stream object while it is still being accessed, leading to use-after-free conditions.
Affected software
Apache Software Foundation
Apache bRPC
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Apache bRPC occurs when an RTMP Abort control message targets the chunk stream currently being parsed. The function RtmpChunkStream::OnAbortMessage calls RtmpContext::ClearChunkStream, which deletes the chunk stream object while its Feed() method is still executing. After the handler returns, Feed() continues to access the deleted object, causing a heap use-after-free. This can be triggered remotely without authentication by sending a crafted Abort message to a bRPC server with RTMP support enabled.
Potential Impact
A remote attacker can cause a denial of service by crashing the bRPC RTMP server. No authentication or application-level request is needed, making the attack feasible from untrusted networks if RTMP support is enabled.
Mitigation Recommendations
Upgrade Apache bRPC to version 1.18.0 or later, which includes a fix that prevents clearing the chunk stream when the Abort message targets the chunk stream currently being parsed. Applying the patch from https://github.com/apache/brpc/pull/3452 also addresses the issue. No other mitigations are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-08-15T08:40:10.439Z
- State
- PUBLISHED
Threat ID: 6ad8aa322cdf04f656e94626
Added to database: 10/21/2026, 12:04:02 UTC
Last enriched: 10/21/2026, 12:19:06 UTC
Last updated: 10/21/2026, 13:40:20 UTC
Views: 6
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