Allocation of Resources Without Limits or Throttling Affecting h2o/h2o package, versions [0,]
Threat Intelligence
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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- published19 Jul 2026
- disclosed17 Jul 2026
- creditUnknown
Introduced: 17 Jul 2026
CVE-2026-54340 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the HTTP/2 stream handling. An attacker can exhaust server resources by sending specially crafted HTTP/2 requests that exploit HPACK decompression amplification combined with stream stalling, leading to excessive retention of decoded header state.