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CVE-2026-54425— Apache bRPC: Stack Exhaustion via Recursive HPACK Dynamic Table Size Update Decoding

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 1.18.0 版本之前，其 HTTP/2 HPACK 解码器中存在不受控的递归问题。远程攻击者可通过发送精心构造的 HTTP/2 头部块（其中包含大量连续的动态表大小更新条目）来触发拒绝服务（DoS）攻击。在解码过程中，每个更新条目都会递归调用 HPACK 解码器，导致在解析到实际头部字段或输入结束之前，线程栈空间即被耗尽。 根本原因： bRPC 的 HPACK 解码器在处理完“动态表大小更新”条目后，会递归地解码下一个条目。由于该解码器未对递归深度进行限制，长序列的更新条目可能消耗过多

AI Predicted 7.5 Difficulty: Trivial

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-54425

Vulnerability Information
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Vulnerability Title
Apache bRPC: Stack Exhaustion via Recursive HPACK Dynamic Table Size Update Decoding
Source: CVE Program / CVE List V5
Vulnerability Description
Uncontrolled recursion in the HTTP/2 HPACK decoder in Apache bRPC before 1.18.0 allows remote attackers to cause denial of service by sending a crafted HTTP/2 header block containing many consecutive Dynamic Table Size Update entries. Each update was decoded by recursively invoking the HPACK decoder, which could exhaust the thread stack before a header field or end of input was reached. Root Cause: The bRPC HPACK decoder recursively decoded the next entry after processing a Dynamic Table Size Update. The decoder did not bound the recursion depth, so a long sequence of update entries could consume excessive stack space. Affected Scenarios: Use bRPC with the built-in HTTP/2 implementation to accept HTTP/2 traffic from an untrusted network. How to Fix: 1. Upgrade bRPC to version 1.18.0, which fixes this issue. 2. Apply this patch: https://github.com/apache/brpc/pull/3343 Note: The fix changes HPACK Dynamic Table Size Update decoding to use iterative parsing instead of recursive parsing.
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-2026-54425

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III. Intelligence Information for CVE-2026-54425

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

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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 → →

IV. Related Vulnerabilities

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

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