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Medium

Eclipse Vert.x memory leak

  • Disclosed: 27.03.2024
  • Updated: 11.10.2026 12:21

A vulnerability in the Eclipse Vert.x toolkit results in a memory leak due to using Netty FastThreadLocal data structures. Specifically, when the Vert.x HTTP client establishes connections to different hosts, triggering the memory leak. The leak can be accelerated with intimate runtime knowledge, allowing an attacker to exploit this vulnerability. For instance, a server accepting arbitrary internet addresses could serve as an attack vector by connecting to these addresses, thereby accelerating the memory leak.

Affected software

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PlatformPackageVulnerable versionsFixed in
Java / Kotlin (Maven) io.vertx:vertx-core >= 4.5.0, < 4.5.2, >= 4.4.5, < 4.4.7 4.5.2, 4.4.7

References

CVSS score 6.5/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE)
CWE-119, CWE-200
Platform
Java / Kotlin (Maven)
Package
io.vertx:vertx-core
Disclosed
27.03.2024
Updated
11.10.2026 12:21

Sources and licenses

OSV / GitHub Advisory Database - GHSA-5667-3wch-7q7w - CC BY 4.0

Vulnerability history: io.vertx:vertx-core

All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.

Total entries
7
First → latest
10.2018 05.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Medium 7

Disclosures per year

  1. Vert.x has a DoS via unbounded server-side SNI SslContext cache growth
    Medium · 5.3 CVE-2026-6860 >= 4.3.4, <= 4.3.8, >= 4.4.0, <= 4.4.9, >= 4.5.0, < 4.5.27, >= 5.0.0, < 5.0.12 4.5.27, 5.0.12
  2. Vert.x Web static handler component cache can be manipulated to deny the access to static files
    Medium CVE-2026-1002 < 4.5.24, >= 5.0.0.CR1, < 5.0.7 4.5.24, 5.0.7
  3. Eclipse Vert.x vulnerable to a memory leak in TCP servers
    Medium · 5.4 CVE-2024-1300 >= 4.3.4, < 4.4.8, >= 4.5.0, < 4.5.3 4.4.8, 4.5.3
  4. Eclipse Vert.x memory leak this entry
    Medium · 6.5 CVE-2024-1023 >= 4.5.0, < 4.5.2, >= 4.4.5, < 4.4.7 4.5.2, 4.4.7
  5. Moderate severity vulnerability that affects io.vertx:vertx-core
    Medium CVE-2018-12537 >= 3.0.0, < 3.5.2 3.5.2
  6. Moderate severity vulnerability that affects io.vertx:vertx-core
    Medium CVE-2018-12544 >= 3.5.0, < 3.5.4 3.5.4
  7. Excessive memory allocation
    Medium · 6.5 CVE-2018-12541 >= 3.0.0, < 3.5.4 3.5.4

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