Vulnerability Details CVE-2026-103223
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 23.1%
CVSS Severity
CVSS v3 Score 5.9
References
Products affected by CVE-2026-103223
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cpe:2.3:a:eclipse:vert.x:4.5.0
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cpe:2.3:a:eclipse:vert.x:4.5.1
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cpe:2.3:a:eclipse:vert.x:4.5.10
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cpe:2.3:a:eclipse:vert.x:4.5.11
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cpe:2.3:a:eclipse:vert.x:4.5.12
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cpe:2.3:a:eclipse:vert.x:4.5.13
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cpe:2.3:a:eclipse:vert.x:4.5.14
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cpe:2.3:a:eclipse:vert.x:4.5.15
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cpe:2.3:a:eclipse:vert.x:4.5.16
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cpe:2.3:a:eclipse:vert.x:4.5.17
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cpe:2.3:a:eclipse:vert.x:4.5.18
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cpe:2.3:a:eclipse:vert.x:4.5.19
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cpe:2.3:a:eclipse:vert.x:4.5.2
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cpe:2.3:a:eclipse:vert.x:4.5.20
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cpe:2.3:a:eclipse:vert.x:4.5.21
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cpe:2.3:a:eclipse:vert.x:4.5.22
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cpe:2.3:a:eclipse:vert.x:4.5.23
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cpe:2.3:a:eclipse:vert.x:4.5.24
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cpe:2.3:a:eclipse:vert.x:4.5.25
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cpe:2.3:a:eclipse:vert.x:4.5.26
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cpe:2.3:a:eclipse:vert.x:4.5.27
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cpe:2.3:a:eclipse:vert.x:4.5.28
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cpe:2.3:a:eclipse:vert.x:4.5.29
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cpe:2.3:a:eclipse:vert.x:4.5.3
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cpe:2.3:a:eclipse:vert.x:4.5.30
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cpe:2.3:a:eclipse:vert.x:4.5.31
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cpe:2.3:a:eclipse:vert.x:4.5.32
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cpe:2.3:a:eclipse:vert.x:4.5.33
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cpe:2.3:a:eclipse:vert.x:4.5.34
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cpe:2.3:a:eclipse:vert.x:4.5.4
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cpe:2.3:a:eclipse:vert.x:4.5.5
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cpe:2.3:a:eclipse:vert.x:4.5.6
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cpe:2.3:a:eclipse:vert.x:4.5.7
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cpe:2.3:a:eclipse:vert.x:4.5.8
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cpe:2.3:a:eclipse:vert.x:4.5.9
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cpe:2.3:a:eclipse:vert.x:5.0.0
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cpe:2.3:a:eclipse:vert.x:5.0.1
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cpe:2.3:a:eclipse:vert.x:5.0.10
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cpe:2.3:a:eclipse:vert.x:5.0.11
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cpe:2.3:a:eclipse:vert.x:5.0.12
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cpe:2.3:a:eclipse:vert.x:5.0.2
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cpe:2.3:a:eclipse:vert.x:5.0.3
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cpe:2.3:a:eclipse:vert.x:5.0.4
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cpe:2.3:a:eclipse:vert.x:5.0.5
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cpe:2.3:a:eclipse:vert.x:5.0.6
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cpe:2.3:a:eclipse:vert.x:5.0.7
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cpe:2.3:a:eclipse:vert.x:5.0.8
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cpe:2.3:a:eclipse:vert.x:5.0.9
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cpe:2.3:a:eclipse:vert.x:5.1.0
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cpe:2.3:a:eclipse:vert.x:5.1.1
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cpe:2.3:a:eclipse:vert.x:5.1.2
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cpe:2.3:a:eclipse:vert.x:5.1.3
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cpe:2.3:a:eclipse:vert.x:5.1.4
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cpe:2.3:a:eclipse:vert.x:5.1.5
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cpe:2.3:a:eclipse:vert.x:5.1.8
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cpe:2.3:a:eclipse:vert.x:5.1.9
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cpe:2.3:a:eclipse:vert.x:5.2.0