CVE-2026-90484 (GCVE-0-2026-90484)

Vulnerability from cvelistv5 – Published: 2026-10-21 12:19 – Updated: 2026-10-26 13:39
VLAI
Title
Apache bRPC: Null pointer dereference in MySQL reply parser leading to client crash
Summary
The MySQL client response parser in Apache bRPC dereferences a null pointer when the server peer sends a zero-payload-length response packet. A response packet whose declared payload length is zero is accepted by the frame-length check (is_full_package), after which the parser reads the response type byte via an unbounded 5-byte fetch that returns nullptr, and type = p[4] dereferences it, crashing the client process. Root Cause: In brpc::policy::MysqlReply::ConsumePartialIOBuf, buf.fetch(header, 5) returns nullptr when the buffered data only holds the 4-byte header of a zero-length packet, then the code reads p[4] (and, in the fast-auth path, p2[4]) without checking for a null or zero-length packet. Affected Scenarios: A brpc MySQL client connecting to a malicious or compromised MySQL server (or a MITM) can be crashed by a zero-length server response packet, resulting in denial of service of the client. Fix: The fix rejects zero-length response packets (returning PARSE_ERROR_ABSOLUTELY_WRONG) both for the initial response type determination and after a fast-auth marker, before reading the type byte. Upgrade to the Apache bRPC version 1.18.0 or apply the PR patch at https://github.com/apache/brpc/pull/3536.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-26 13:39 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
apache CNA under the mitre root
CNA scorecard B 76/100 over 1074 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Apache Software Foundation Apache bRPC Affected: <= 1.11.0 , < 1.18.0 (semver)
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