Allocation of Resources Without Limits or Throttling Affecting io.vertx:vertx-core package, versions [4.3.4,4.5.27)[5.0.0.CR1,5.0.12)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published6 May 2026
- disclosed6 May 2026
- creditJIHUN KIM
Introduced: 6 May 2026
CVE-2026-6860 (opens in a new tab)How to fix?
Upgrade io.vertx:vertx-core to version 4.5.27, 5.0.12 or higher.
Overview
io.vertx:vertx-core is a tool-kit for building reactive applications on the JVM.
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling during the TLS handshake process, where the SslContext cache can be forced to grow indefinitely. The SSLHelper, SslChannelProvider, and SslContextProvider classes responsible for this caching in different versions all exhibit the same vulnerable behavior. A malicious client can disrupt service by sending a large number of distinct valid SNI names. This is particularly likely when the server has a broad hostname rule such as a wildcard.