Unbounded memory allocation in Eclipse Vert.x MSSQL 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-400.
Summary
Eclipse Vert.x versions from 4.0.0 through 4.5.34, from 5.0.0 through 5.0.12, from 5.1.0 through 5.1.9, and 5.2.0 are affected. The TDS message decoder in the vertx-mssql-client module collects inbound packets without any cumulative size limit (CWE-400). A malicious, compromised, or man-in-the-middle SQL Server can stream packets without the end-of-message flag, exhausting direct memory and crashing the client with an out-of-memory error before authentication completes.
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 TDS message decoder in the Vert.x MSSQL client (vertx-mssql-client) aggregates inbound TDS packets into a composite direct-memory buffer without any cumulative size limit. A malicious, compromised, or man-in-the-middle SQL Server can send a continuous stream of TDS packets without setting the END_OF_MESSAGE status flag, causing unbounded direct-memory allocation on the client and leading to an out-of-memory crash. This occurs before authentication completes. The impacted component is io.vertx:vertx-mssql-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
No fixed version is listed for Eclipse Vert.x. Red Hat lists the Red Hat build of Quarkus as affected, with its plan set to none 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-2026-102462
- 2026-10-21 Alias added: GHSA-xrjr-rf8w-fphg
- 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-2026-102462 · CVE Program
- CVE-2026-102462 · NVD
- FIRST EPSS
- GHSA-xrjr-rf8w-fphg · GitHub Advisory Database · CC BY 4.0
- CVE-2026-102462 · 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