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Advisory record · GHSA-3g76-f9xq-8vp6

Vert.x has a DoS via unbounded server-side SNI SslContext cache growth

CVSS 6.9 MediumEPSS 0.0024 · 14th percentile

Published by the GitHub Advisory Database at 9 May 2026, 00:38 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.vertx:vertx-coreMaven>=4.3.4, <=4.3.8 || >=4.4.0, <=4.4.9 || >=4.5.0, <4.5.27 || >=5.0.0, <5.0.124.5.27, 5.0.12
Identifiers
GHSA-3g76-f9xq-8vp6 · CVE-2026-6860
Weakness (CWE)
CWE-295 · CWE-770
Tags
Published
9 May 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Vert.x (io.vertx:vertx-core) versions 4.3.4 through 4.3.8, 4.4.0 through 4.4.9, 4.5.0 through 4.5.26, and 5.0.0 through 5.0.11 cache a server-side SslContext for each matching SNI name when SNI is enabled with wildcard or broad hostname mappings. An unauthenticated remote client can send many distinct matching SNI names, causing memory use to grow and possibly leading to denial of service. Upgrade to 4.5.27 or 5.0.12. The source gives few details on a workaround.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.9 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L CNA (eclipse)
  • CISA KEV Not listed.
  • EPSS 0.0024, the 14th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.