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.
References
| Link | Resource |
|---|---|
| https://github.com/eclipse-vertx/vertx-sql-client/security/advisories/GHSA-hm2j-xp3c-jff2 | Vendor Advisory |
| https://gitlab.eclipse.org/security/cve-assignment/-/work_items/354 | Issue Tracking Third Party Advisory |
Configurations
Configuration 1 (hide)
|
History
20 Oct 2026, 19:25
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Eclipse
Eclipse vert.x |
|
| CPE | cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:* cpe:2.3:a:eclipse:vert.x:5.2.0:*:*:*:*:*:*:* |
|
| References | () https://github.com/eclipse-vertx/vertx-sql-client/security/advisories/GHSA-hm2j-xp3c-jff2 - Vendor Advisory | |
| References | () https://gitlab.eclipse.org/security/cve-assignment/-/work_items/354 - Issue Tracking, Third Party Advisory | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.9 |
15 Oct 2026, 15:17
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-789 |
15 Oct 2026, 09:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-10-15 09:17
Updated : 2026-10-20 19:25
NVD link : CVE-2026-103223
Mitre link : CVE-2026-103223
CVE.ORG link : CVE-2026-103223
JSON object : View
Products Affected
eclipse
- vert.x
CWE
CWE-789
Memory Allocation with Excessive Size Value