Vert.x has a DoS via unbounded server-side SNI SslContext cache growth — CVE-2026-6860

Summary

Potential unbounded server-side SNI `SslContext` cache growth in Vert.x TLS handling, with possible resource-exhaustion / DoS impact. On affected versions, matching server-side SNI names are cached via `computeIfAbsent(serverName, ...)` in a serverName-keyed `SslContext` cache, and I could not find any bound, TTL, or eviction for that cache. The implementation differs slightly by branch, but the same sink appears…

Product

maven: io.vertx:vertx-core

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

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