Allocation of Resources Without Limits or Throttling Affecting io.netty:netty-codec-http3 package, versions [4.2.0.Alpha1,4.2.15.Final)
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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- published14 Jun 2026
- disclosed12 Jun 2026
- creditVioleta Georgieva
Introduced: 12 Jun 2026
NewCVE-2026-48748 (opens in a new tab)How to fix?
Upgrade io.netty:netty-codec-http3 to version 4.2.15.Final or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in shouldWaitForDynamicTableUpdates in QpackDecoder. An attacker can open an indefinite number of persistently blocked streams by sending headers that reference dynamic table entries the server has not yet received. Each stream's ReadResumptionListener is retained for the connection's lifetime, exhausting memory and crashing the JVM.
Workaround
This vulnerability can be avoided by setting HTTP3_SETTINGS_QPACK_BLOCKED_STREAMS to a nonzero value.