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CVE-2026-102465

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-15 · updated 2026-10-20
• Weakness: CWE-770

Description

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 Vert.x Redis client RESP parser pre-allocates arrays to a length declared by the server without enforcing an upper bound. A malicious or compromised Redis server, or an attacker in a man-in-the-middle position, can send a crafted RESP response declaring an extremely large array, push, or attribute length, causing the client to attempt a massive heap allocation. The resulting OutOfMemoryError crashes the Vert.x event loop thread, denying service to all connections and verticles sharing that loop. The impacted component is io.vertx:vertx-mysql-client.

Affected products

• Eclipse Foundation Eclipse Vert.x: from 4.5.0 before 4.5.35; from 5.0.0 before 5.1.10; 5.2.0 — fixed in 4.5.35, 5.1.10

How to fix

Upgrade to a fixed version: Eclipse Foundation Eclipse Vert.x 4.5.35, 5.1.10. Check the vendor advisory for mitigations.

References

• https://github.com/vert-x3/vertx-redis-client/security/advisories/GHSA-4wf9-p5hg-98w5
• https://gitlab.eclipse.org/security/cve-assignment/-/work_items/343

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