Allocation of Resources Without Limits or Throttling Affecting org.apache.httpcomponents.core5:httpcore5-h2 package, versions [,5.4.2)[5.5-alpha1,5.5-beta1)
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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- published4 Jul 2026
- disclosed1 Jul 2026
- creditUnknown
Introduced: 1 Jul 2026
NewCVE-2026-54428 (opens in a new tab)How to fix?
Upgrade org.apache.httpcomponents.core5:httpcore5-h2 to version 5.4.2, 5.5-beta1 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling due to the lack of enforced limits in the HPackDecoder process. An attacker can exhaust system memory by sending oversized compressed header blocks before the HTTP/2 SETTINGS acknowledgement applies the configured header list size limit.