Bug 2553099 (CVE-2026-103224)

Summary: CVE-2026-103224 io.vertx/vertx-mysql-client: vertx-mysql-client: Denial of Service via unbounded memory allocation during packet decoding
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: ant, cescoffi, fmongiar, gsmet, jmartisk, manderse, olubyans, ozzy, pjindal, rguimara, sbiarozk, varjain
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in vertx-mysql-client. This vulnerability allows a malicious or compromised MySQL server to cause a Denial of Service (DoS) by crashing the client application. Because the MySQL message decoder fails to enforce a cumulative size limit when reassembling multi-packet messages, a server can continuously send maximum-sized packets before authentication completes. This causes unbounded memory allocation on the client system, exhausting available resources and leading to an out-of-memory crash.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-15 08:33:37 UTC 
In Eclipse Vert.x versions [4.0.0, 4.5.34] or [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the MySQL message decoder aggregates inbound multi-packet payloads into a composite direct-memory buffer without any cumulative size limit. A malicious, compromised, or man-in-the-middle MySQL server can send a continuous stream of packets with the maximum payload length (0xFFFFFF), preventing the end-of-message condition from being reached, causing unbounded direct-memory allocation on the client and leading to an out-of-memory crash. This occurs before authentication completes.



The impacted component is io.vertx:vertx-mysql-client.