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CVE-2026-87849— Apache bRPC: Out-of-bounds read via non-object fields in Discovery naming-service reply parsing

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（版本低于 1.18.0）中的 Discovery 命名服务响应解析器，在未先验证 JSON 值是否为对象的情况下，直接对它们调用了 RapidJSON 的仅适用于对象的访问器（FindMember）。如果 Discovery 响应被恶意构造，其 data、service 成员或 instances 列表中包含非对象条目（例如裸整数），就会触发 RapidJSON 在客户端的对象访问前置条件检查失败，导致越界读取内存，并可能引发 bRPC 客户端崩溃。 根本原因： 在 src/brpc/pol

AI Predicted 7.5 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-87849

Vulnerability Information
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Vulnerability Title
Apache bRPC: Out-of-bounds read via non-object fields in Discovery naming-service reply parsing
Source: CVE Program / CVE List V5
Vulnerability Description
The Discovery naming-service reply parser in Apache bRPC (versions < 1.18.0) calls RapidJSON object-only accessors (FindMember) on JSON values without first validating that those values are objects. A malformed Discovery response whose data/service members or instances list contain non-object entries (e.g. a bare integer) triggers the RapidJSON object-access precondition on the client, reading memory out of bounds and potentially crashing the bRPC client. Root Cause: In src/brpc/policy/discovery_naming_service.cpp, DiscoveryNamingService::GetServers() and DiscoveryNames::ListDiscoveryNodes() access JSON values with member functions on non-object values. RapidJSON only defines these operations for object types; invoking them on a non-object violates the class invariant and results in undefined behavior (out-of-bounds read), commonly crashing the process. Affected Scenarios: An operator-configured (or compromised) Discovery backend returns a malformed /discovery/nodes or /discovery/fetchs response whose data/service/instance entries are not JSON objects, crashing any bRPC client that refreshes its server list. How to Fix: 1. Upgrade bRPC to version 1.18.0 or later, which fixes this issue. 2. Apply this patch: https://github.com/apache/brpc/pull/3533 The fix validates that the Discovery response data, per-service data, and instance entries are JSON objects (and skips non-object node/instance entries and rejects non-object data/service values) before calling member accessors.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
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-2026-87849

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III. Intelligence Information for CVE-2026-87849

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Other References for CVE-2026-87849 (2)

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

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CVE-2026-59229 Apache IoTDB: Legacy Pipe Privilege Escalation
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CVE-2026-41114 Apache IoTDB JDBC driver: Large-scale Memory Exhaustion via BigDecimal toPlainString in JD
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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-125

V. Comments for CVE-2026-87849

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