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CVE-2026-56388— Apache bRPC: Out-of-Bounds Write in Redis Command 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 中的 Redis 服务器命令解析器接受空的 RESP 数组作为命令头。任何能够访问启用了 Redis 服务的 bRPC 服务器的远程未认证攻击者，均可发送一个空的数组头，随后紧跟一个大块字符串（bulk string），从而在解析器中引发越界写操作，导致进程崩溃。 根本原因： RedisCommandParser::ConsumeImpl 会拒绝负的 RESP 数组计数，但接受零值。当接收到零时，该函数将命令参数向量调整为零个元素，并继续解析。随后在解析大块字符串时，唯一的索引保护机制是一个

AI Predicted 9.8 Difficulty: Easy
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I. Basic Information for CVE-2026-56388

Vulnerability Information
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Vulnerability Title
Apache bRPC: Out-of-Bounds Write in Redis Command Parser
Source: CVE Program / CVE List V5
Vulnerability Description
The Redis server command parser in Apache bRPC accepts an empty RESP array as a command header. A remote unauthenticated attacker who can reach a bRPC server with Redis service enabled can send an empty array header followed by a bulk string, causing an out-of-bounds write in the parser and crashing the process. Root Cause: RedisCommandParser::ConsumeImpl rejected negative RESP array counts but accepted zero. It resized the command argument vector to zero elements and continued parsing. When a following bulk string was parsed, the only index guard was a CHECK. In configurations where fatal logs do not abort immediately, execution could continue and write to _args[0] even though the vector was empty. Affected Scenarios: Deployments that enable ServerOptions.redis_service and accept Redis protocol traffic from untrusted clients. The issue is reached during parsing before command handling or authentication. 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/3354 Note: The fix rejects empty RESP arrays as invalid Redis commands and replaces the internal index CHECK with an explicit parse error so malformed command streams cannot fall through to an indexed vector write.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
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-2026-56388

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III. Intelligence Information for CVE-2026-56388

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

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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 → →

IV. Related Vulnerabilities

Same product: Apache bRPC
Same vendor: Apache Software Foundation
Same weakness: CWE-787

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