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CVE-2026-82230— Apache bRPC: Stack Exhaustion via Unbounded Recursion in mcpack2pb Parser

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.

在 Apache bRPC（版本 < 1.18.0）的所有平台上， 组件存在不受控的递归漏洞，允许远程攻击者通过发送深度嵌套的 mcpack 数据导致服务器崩溃。 根本原因： bRPC 的 解析器（用于处理 、 和 请求）在解析嵌套对象和数组时未设置任何深度限制。对于引用自身的 Protobuf 消息（例如包含重复消息字段的消息），生成的解析器会对每个输入 mcpack 对象的嵌套层级执行一次递归。当请求中包含极深嵌套结构时，递归调用将无限增长，导致栈溢出并引发进程崩溃。 受影响场景： 使用具有递归模式（recur

AI Predicted 7.5 Difficulty: Trivial

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache bRPC < 1.18.0 affected
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I. Basic Information for CVE-2026-82230

Vulnerability Information
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Vulnerability Title
Apache bRPC: Stack Exhaustion via Unbounded Recursion in mcpack2pb Parser
Source: CVE Program / CVE List V5
Vulnerability Description
Uncontrolled recursion in the mcpack2pb component in Apache bRPC (version < 1.18.0) on all platforms allows remote attackers to make the server crash via sending deeply nested mcpack data. Root Cause: The bRPC mcpack2pb parser (used to serve nshead_mcpack / ubrpc / public_pbrpc requests) recursively parses nested objects and arrays without any depth limit. For a protobuf message that references itself (e.g. a repeated message field), the generated parser recurses once per nesting level of the incoming mcpack object. A deeply nested request makes the recursion grow unbounded, overflow the stack and crash the process. Affected Scenarios: Use bRPC server with a recursive-schema protobuf message to serve nshead_mcpack / ubrpc / public_pbrpc requests from untrusted network. 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/3499 Note: No matter which option you choose, you should know that the fix enforces the documented parsing depth limit MAX_DEPTH (128) on the parse path, the same limit the serializer already applies. If your requests contain mcpack messages nested deeper than 128 levels, the request will be failed after applying the fix.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
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-2026-82230

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III. Intelligence Information for CVE-2026-82230

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Same Patch Batch · Apache Software Foundation · 2026-10-21 · 69 CVEs total

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CVE-2026-111815 10.0 CRITICAL Apache Traffic Server: TLS session ticket resumption bypasses per-SNI verify_client STRICT
CVE-2026-111814 10.0 CRITICAL Apache Traffic Server: Default server_session_sharing.match omits MASK_CERT, allowing pool
CVE-2026-111809 9.3 CRITICAL Apache Traffic Server: HEAD requests carrying Content-Length or Transfer-Encoding enable r
CVE-2026-111816 9.3 CRITICAL Apache Traffic Server: A malformed 302 response bypasses parse-error rejection through the
CVE-2026-105869 9.2 CRITICAL Apache Pulsar: MultiRolesTokenAuthorizationProvider uses roles from unverified tokens for
CVE-2026-111811 9.0 CRITICAL Apache Traffic Server: tsmemcache plugin exposes the shared proxy cache over the network w
CVE-2025-31699 8.9 HIGH Apache Traffic Server: Origin connection still owed a request body is reused, enabling req
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CVE-2025-55702 8.7 HIGH Apache Traffic Server: An unread Expect: 100-continue request body is framed as a new requ
CVE-2026-111808 8.6 HIGH Apache Traffic Server: HTTP/2 DATA frame padding underflow lets a client trigger backend w
CVE-2026-111805 8.6 HIGH Apache Traffic Server: HTTP/2 Content-Length truncation lets a client trigger backend work
CVE-2026-111804 8.2 HIGH Apache Traffic Server: wasm plugin has a use-after-free and forwards unvalidated guest met
CVE-2026-105945 7.7 HIGH Apache Pulsar: Improper Validation of Package Name Components Allows Cross-Tenant Package
CVE-2026-105942 7.7 HIGH Apache Pulsar: Original principal of proxied requests authorized with the proxy's authenti
CVE-2026-111810 7.5 HIGH Apache Traffic Server: Unthrottled per-header diagnostic logging enables a log-flood denia
CVE-2026-105934 7.2 HIGH Apache Pulsar: Missing tenant admin authorization check when truncating a partitioned topi
CVE-2026-105930 6.0 MEDIUM Apache Pulsar: Improper Authorization of Function, Source and Sink Package URLs Allows Cro

Showing top 20 of 69 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Apache bRPC
Same vendor: Apache Software Foundation
Same weakness: CWE-674

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