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CVE-2026-54427— Apache bRPC: Stack Exhaustion via Unbounded Recursion in AMF 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.

Apache bRPC 版本低于 1.18.0 的 AMF 解析器存在不受控的递归问题，允许远程 RTMP 对等端通过发送深度嵌套的 AMF 对象或数组导致 bRPC 进程崩溃。该解析器在处理嵌套 AMF 容器时未实施深度限制，从而导致原生调用栈耗尽。 受影响场景： 使用 bRPC 的 RTMP 支持并从不可信的 RTMP 对等端解析 AMF 数据的应用程序。这包括： 解析客户端命令消息的 RTMP 服务器； 解析服务器响应或状态消息的 RTMP 客户端； 任一方解析传入的 AMF 脚本数据（如元数据或提示点）；

AI Predicted 5.5 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-54427

Vulnerability Information
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Vulnerability Title
Apache bRPC: Stack Exhaustion via Unbounded Recursion in AMF Parser
Source: CVE Program / CVE List V5
Vulnerability Description
Uncontrolled recursion in the AMF parser in Apache bRPC < 1.18.0 allows a remote RTMP peer to crash a bRPC process by sending deeply nested AMF objects or arrays. The parser recursively processed nested AMF containers without enforcing a depth limit, which could exhaust the native stack. Affected Scenarios: Applications using bRPC RTMP support and parsing AMF data from an untrusted RTMP peer. This includes RTMP servers parsing client command messages, RTMP clients parsing server responses or status messages, and either side parsing inbound AMF script data such as metadata or cue points. Direct callers of ReadAMFObject or ReadAMFArray on untrusted input are also affected. How to Fix: 1. Upgrade Apache bRPC to 1.18.0. 2. Apply the patch from PR https://github.com/apache/brpc/pull/3344 . Note: The fix introduces a configurable AMF nesting depth limit with default value 128. AMF objects or arrays deeper than amf_max_depth are rejected 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-2026-54427

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III. Intelligence Information for CVE-2026-54427

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Same Patch Batch · Apache Software Foundation · 2026-10-21 · 59 CVEs total

CVE-2026-111813 10.0 CRITICAL Apache Traffic Server: magick plugin passes client query strings unfiltered to ImageMagick
CVE-2026-105944 10.0 CRITICAL Apache Pulsar Manager: Missing authentication and authorization and disclosure of the Puls
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-2025-31699 8.9 HIGH Apache Traffic Server: Origin connection still owed a request body is reused, enabling req
CVE-2026-105937 8.7 HIGH Apache Pulsar: Missing authorization of the shadow topic source allows cross-tenant messag
CVE-2025-55702 8.7 HIGH Apache Traffic Server: An unread Expect: 100-continue request body is framed as a new requ
CVE-2026-111804 8.2 HIGH Apache Traffic Server: wasm plugin has a use-after-free and forwards unvalidated guest met
CVE-2026-105942 7.7 HIGH Apache Pulsar: Original principal of proxied requests authorized with the proxy's authenti
CVE-2026-105945 7.7 HIGH Apache Pulsar: Improper Validation of Package Name Components Allows Cross-Tenant Package
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
CVE-2026-105936 5.3 MEDIUM Apache Pulsar: Functions connectors list endpoint does not apply the super-user check of t
CVE-2026-105926 5.3 MEDIUM Apache Pulsar: Missing Topic Authorization on Binary Protocol GetSchema and GetOrCreateSch
CVE-2026-105935 4.9 MEDIUM Apache Pulsar: Function trigger publishes to the input topic without checking the caller's
CVE-2026-105927 2.3 LOW Apache Pulsar: Improper authorization of WebSocket consumer dead letter topic allows write
CVE-2026-105938 2.3 LOW Apache Pulsar: Subscription authorization policies not enforced by namespace-level backlog
CVE-2026-105932 2.3 LOW Apache Pulsar: Missing topic policy authorization on non-persistent topic entry filter end
CVE-2026-105931 2.3 LOW Apache Pulsar: Missing authorization on transaction admin endpoints exposes transaction co
CVE-2026-105933 2.3 LOW Apache Pulsar: Namespace encryption requirement not enforced after a failure during topic

Showing top 20 of 59 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-54427

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