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.
CVE-2026-103223
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-103223
Eclipse Vert.x
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "Eclipse Foundation",
"product": "Eclipse Vert.x",
"versions": [
{
"status": "affected",
"version": "4.0.0",
"versionType": "semver",
"lessThanOrEqual": "4.5.34"
},
{
"status": "affected",
"version": "5.0.0",
"versionType": "semver",
"lessThanOrEqual": "5.0.12"
},
{
"status": "affected",
"version": "5.1.0",
"versionType": "semver",
"lessThanOrEqual": "5.1.9"
},
{
"status": "affected",
"version": "5.2.0",
"versionType": "semver"
}
],
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-103223
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #28807 · Revision 1
- Added to Heist Feed
- Publisher date