Bug 2553097 (CVE-2026-103223)

Summary: CVE-2026-103223 io.vertx/vertx-pg-client: vertx-pg-client: Denial of Service via unvalidated message length
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-pg-client. A malicious, compromised, or intermediary database server can trigger a Denial of Service (DoS) condition by sending a message header containing an excessively large length value before authentication completes. Because the client does not properly validate the message length, it buffers incoming network data without bounds, leading to excessive memory consumption and an out-of-memory crash of the client application.
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Description OSIDB Bzimport 2026-10-15 08:33:10 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 PostgreSQL message decoder reads the 4-byte message length field from the PostgreSQL wire protocol without any maximum validation. A malicious, compromised, or man-in-the-middle PostgreSQL server can send a message header with the length field set to an extremely large value (up to Integer.MAX_VALUE), causing the decoder to accumulate subsequent TCP data into a composite buffer without bound, leading to unbounded memory allocation on the client and an out-of-memory crash. This occurs before authentication completes.



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