Allocation of Resources Without Limits or Throttling Affecting io.netty:netty-codec-http package, versions [,4.1.138.Final)[4.2.0.Final,4.2.18.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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- published24 Sept 2026
- disclosed10 Sept 2026
- creditUnknown
Introduced: 10 Sep 2026
NewCVE-2026-93488 (opens in a new tab)How to fix?
Upgrade io.netty:netty-codec-http to version 4.1.138.Final, 4.2.18.Final or higher.
Overview
io.netty:netty-codec-http is a network application framework for rapid development of maintainable high performance protocol servers & clients.
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in SpdySessionHandler, whose localConcurrentStreams limit defaults to Integer.MAX_VALUE and which exposes no public API to lower it. An attacker can exhaust heap and direct memory and drive the JVM to OutOfMemoryError by sending a large number of SYN_STREAM frames with FLAG_FIN=0 over a single connection, each opening a stream whose tracking state persists. This requires the service to accept SPDY connections from untrusted sources, and one connection is sufficient.