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CVE-2026-84727— Apache bRPC: Use-After-Free in RTMP Chunk Stream Handling via Abort Message

Quick assessment

Affected
Apache Software Foundation Apache bRPC
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache bRPC（版本 < 1.18.0）在所有平台上，其 RTMP 协议实现中存在一个“释放后使用”（Use-after-free）漏洞。该漏洞允许恶意的 RTMP 对等端通过构造特殊的 Abort 消息，导致进程崩溃或潜在地破坏内存。 根本原因： 在处理 RTMP Abort 消息（协议控制消息类型 2）时，RTMP 策略实现会删除目标 对象。然而，发送路径（ -> ）在发送线程上并发运行，且在没有同步机制的情况下解引用了同一个 对象。如果远程对等端发送一条 Abort 消息，指定一个正在被并发用于序列化

AI Predicted 8.1 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-84727

Vulnerability Information
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Vulnerability Title
Apache bRPC: Use-After-Free in RTMP Chunk Stream Handling via Abort Message
Source: CVE Program / CVE List V5
Vulnerability Description
Use-after-free in the RTMP protocol implementation in Apache bRPC (version < 1.18.0) on all platforms allows a malicious RTMP peer to crash the process or potentially corrupt memory via a crafted Abort message. Root Cause: When processing an RTMP Abort (protocol control message type 2), the RTMP policy implementation deleted the target RtmpChunkStream object. The send path (RtmpUnsentMessage::AppendAndDestroySelf -> RtmpChunkStream::SerializeMessage) runs concurrently on sender threads and dereferences the same RtmpChunkStream object without synchronization. If a remote peer sends an Abort message naming a chunk stream that is concurrently being used to serialize an outgoing message, the stream object is freed while still in use, resulting in a use-after-free. Additionally, deleting the chunk stream discarded its previous message header, so subsequent compressed (type-3) chunk headers on that stream could no longer be decoded. Affected Scenarios: Any application using the bRPC RTMP protocol implementation (rtmp policy), either as an RTMP server or as an RTMP client, where the remote endpoint is untrusted. The attacker needs to send an Abort message targeting a chunk stream id that is concurrently used for sending, which can crash the process or lead to memory corruption. How to Fix: (Choose one of the following options) 1. Upgrade bRPC to version 1.18.0, which fixes this issue. 2. Apply this patch: https://github.com/apache/brpc/pull/3515
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache bRPC 0 ~ 1.18.0 -

II. Public POCs for CVE-2026-84727

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III. Intelligence Information for CVE-2026-84727

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Other References for CVE-2026-84727 (2)

Same Patch Batch · Apache Software Foundation · 2026-10-21 · 39 CVEs total

CVE-2026-56386 Apache bRPC: Integer Underflow and Out-of-Bounds Read in HTTP/2 DATA Frame Parser
CVE-2026-74758 Apache bRPC: Heap Use-After-Free in RTMP Abort Message Handling
CVE-2026-74757 Apache bRPC: Uncontrolled Memory Allocation via Malicious mcpack Array Item Count
CVE-2026-74755 Apache bRPC: Integer Underflow in mcpack2pb Parser Leading to Denial of Service
CVE-2026-66392 Apache bRPC: TLS Client Accepts Certificates for Mismatched Peer Names
CVE-2026-61916 Apache bRPC: Out-of-bounds Read in URL and Header Lookup Tables on Unsigned-char Platforms
CVE-2026-61902 Apache bRPC: Memory Exhaustion Through Inconsistent Message Body Limits
CVE-2026-58064 Apache bRPC: Denial of Service via Unbounded Redis Inline Command Allocation
CVE-2026-56388 Apache bRPC: Out-of-Bounds Write in Redis Command Parser
CVE-2026-56387 Apache bRPC: Remote Memory Exhaustion in RTMP AMF Parser
CVE-2026-78048 Apache bRPC: Remote Denial of Service via Out-of-Bounds Dynamic Table Sizing in HPACK Deco
CVE-2026-54427 Apache bRPC: Stack Exhaustion via Unbounded Recursion in AMF Parser
CVE-2026-54426 Apache bRPC: Stack Exhaustion via Unbounded Recursion in Redis Reply Parser
CVE-2026-54425 Apache bRPC: Stack Exhaustion via Recursive HPACK Dynamic Table Size Update Decoding
CVE-2026-48830 Apache bRPC: HTTP builtin request can mark a connection authenticated and bypass auth for
CVE-2026-59229 Apache IoTDB: Legacy Pipe Privilege Escalation
CVE-2026-59562 Apache IoTDB: Remote code execution and Unauthenticated path traversal in legacy pipe send
CVE-2026-41114 Apache IoTDB JDBC driver: Large-scale Memory Exhaustion via BigDecimal toPlainString in JD
CVE-2026-58663 Apache IoTDB: Auth Bypass in pipeTransfer() interface
CVE-2026-82231 Apache bRPC: Malformed Thrift T_EXCEPTION reply causes process termination in Thrift clien

Showing top 20 of 39 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Apache bRPC
Same vendor: Apache Software Foundation
Same weakness: CWE-416

V. Comments for CVE-2026-84727

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