Bug 2553104 (CVE-2026-102462)

Summary: CVE-2026-102462 io.vertx/vertx-mssql-client: Vert.x MSSQL client: Denial of Service via unbounded memory allocation during TDS packet processing
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
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Hardware: All   
OS: Linux   
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A flaw was found in the Vert.x MSSQL client. A malicious, compromised, or adversary-in-the-middle database server can cause a Denial of Service (DoS) by sending a continuous stream of Tabular Data Stream (TDS) packets without setting the end-of-message flag. Because the client aggregates inbound packets into direct memory without enforcing a cumulative size limit, this flaw can lead to unbounded memory consumption and crash the application before authentication finishes.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-15 08:35:23 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 TDS message decoder in the Vert.x MSSQL client (vertx-mssql-client) aggregates inbound TDS packets into a composite direct-memory buffer without any cumulative size limit. A malicious, compromised, or man-in-the-middle SQL Server can send a continuous stream of TDS packets without setting the END_OF_MESSAGE status flag, 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-mssql-client.