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CVE-2026-90484— Apache bRPC: Null pointer dereference in MySQL reply parser leading to client crash

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 中的 MySQL 客户端响应解析器在服务器对等端发送一个载荷长度为零的响应包时，会解引用空指针。具体而言，当响应包声明的载荷长度为零时，该包能通过帧长度检查（ ）；随后，解析器执行一次无界 5 字节读取操作以获取响应类型字节，该操作返回 ，而代码随即执行 对其进行解引用，导致客户端进程崩溃。 根本原因：在 函数中，当缓冲区仅包含零长度包的 4 字节头部时， 会返回 。然而，后续代码在未检查是否为空指针或零长度包的情况下，直接读取了 （在快速认证路径中还包括 ）。 受影响场景：连接到恶意或已被

AI Predicted 5.9 Difficulty: Trivial

Possible ATT&CK Techniques 1 AI

T1499.005
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I. Basic Information for CVE-2026-90484

Vulnerability Information
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Vulnerability Title
Apache bRPC: Null pointer dereference in MySQL reply parser leading to client crash
Source: CVE Program / CVE List V5
Vulnerability Description
The MySQL client response parser in Apache bRPC dereferences a null pointer when the server peer sends a zero-payload-length response packet. A response packet whose declared payload length is zero is accepted by the frame-length check (is_full_package), after which the parser reads the response type byte via an unbounded 5-byte fetch that returns nullptr, and type = p[4] dereferences it, crashing the client process. Root Cause: In brpc::policy::MysqlReply::ConsumePartialIOBuf, buf.fetch(header, 5) returns nullptr when the buffered data only holds the 4-byte header of a zero-length packet, then the code reads p[4] (and, in the fast-auth path, p2[4]) without checking for a null or zero-length packet. Affected Scenarios: A brpc MySQL client connecting to a malicious or compromised MySQL server (or a MITM) can be crashed by a zero-length server response packet, resulting in denial of service of the client. Fix: The fix rejects zero-length response packets (returning PARSE_ERROR_ABSOLUTELY_WRONG) both for the initial response type determination and after a fast-auth marker, before reading the type byte. Upgrade to the Apache bRPC version 1.18.0 or apply the PR patch at https://github.com/apache/brpc/pull/3536.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache bRPC <= 1.11.0 ~ 1.18.0 -

II. Public POCs for CVE-2026-90484

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III. Intelligence Information for CVE-2026-90484

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Other References for CVE-2026-90484 (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-476

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