Excessive memory allocation in Eclipse Vert.x PostgreSQL client
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Deferred Red Hat: fix deferred
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-789.
Summary
Eclipse Vert.x versions 4.0.0 through 4.5.34, 5.0.0 through 5.0.12, 5.1.0 through 5.1.9 and from 5.2.0 ship a flawed vertx-pg-client binary array decoder. The decoder allocates an array sized by a 32-bit dimension count sent by the server, with no upper bound (CWE-789). A malicious or compromised PostgreSQL server, or an on-path attacker on an unencrypted connection, sends a crafted DataRow message that crashes the client with an OutOfMemoryError.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Description from the CNA
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 binary array decoder in vertx-pg-client (DataTypeCodec.binaryDecodeArray) allocates a Java array sized by a server-declared 32-bit dimension count with no upper bound. A malicious or compromised PostgreSQL server, or an on-path attacker intercepting an unencrypted connection, can send a crafted DataRow message with an excessively large array dimension value, causing the client to attempt a multi-gigabyte heap allocation and crash with an OutOfMemoryError. The impacted component is io.vertx:vertx-pg-client.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Eclipse Foundation | Eclipse Vert.x | 4.0.0 – 4.5.34; 5.0.0 – 5.0.12; 5.1.0 – 5.1.9; 5.2.0 | — | No fix listed | CNA |
- Eclipse Vert.x VendorEclipse Foundation Affected 4.0.0 – 4.5.34; 5.0.0 – 5.0.12; 5.1.0 – 5.1.9; 5.2.0 Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:* | 4.5.0 to before 4.5.35; 5.0.0 to before 5.1.10 | Vulnerable | Eclipse Foundation |
| cpe:2.3:a:eclipse:vert.x:5.2.0:*:*:*:*:*:*:* | 5.2.0 | Vulnerable | Eclipse Foundation |
- cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:* Versions 4.5.0 to before 4.5.35; 5.0.0 to before 5.1.10 Vulnerable ·Eclipse Foundation
- cpe:2.3:a:eclipse:vert.x:5.2.0:*:*:*:*:*:*:* Versions 5.2.0 Vulnerable ·Eclipse Foundation
Remediation
The sources list no fixed version for Eclipse Vert.x. Red Hat lists the Red Hat build of Quarkus as affected, with no fix available.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat build of Quarkus | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-16 Threatist record created from CVE-2026-102463
- 2026-10-21 Alias added: GHSA-fqmh-j4r4-hgmj
- 2026-10-21 CVSS score added · NVD
- 2026-11-03 Affected versions changed · Red Hat
- 2026-11-03 CVSS score added · Red Hat
References
More Eclipse Foundation Vert.x vulnerabilities
- TI-2026-06017 Improper certificate validation in Eclipse Vert.x CVSS 4.0MEDIUM 6.9
- TI-2025-10971 In Eclipse Vert.x versions [4.0.0, 4.5.21] and [5.0.0, 5.0.4], a StaticHandler… CVSS 4.0MEDIUM 6.3
- TI-2019-13165 Path traversal in Eclipse Vert.x CVSS 3.1CRITICAL 9.8
- TI-2018-09003 XML external entity injection in Eclipse Vert.x CVSS 3.0CRITICAL 9.8
- TI-2018-09001 Path traversal in Eclipse Vert.x CVSS 3.0CRITICAL 9.8
- TI-2025-10972 Cross-site scripting in Eclipse Foundation Vert.x CVSS 4.0LOW 2.3
Sources
- CVE-2026-102463 · CVE Program
- CVE-2026-102463 · NVD
- FIRST EPSS
- GHSA-fqmh-j4r4-hgmj · GitHub Advisory Database · CC BY 4.0
- CVE-2026-102463 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences