Allocation of Resources Without Limits or Throttling Affecting io.netty:netty-codec-http2 package, versions [4.1.0.Final,4.1.136.Final)[4.2.0.Final,4.2.16.Final)
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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- published22 Jul 2026
- disclosed21 Jul 2026
- creditUnknown
Introduced: 21 Jul 2026
NewCVE-2026-56819 (opens in a new tab)How to fix?
Upgrade io.netty:netty-codec-http2 to version 4.1.136.Final, 4.2.16.Final or higher.
Overview
io.netty:netty-codec-http2 is a HTTP2 sub package for the netty library, an event-driven asynchronous network application framework.
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the Http2Decompressor.decompress. An attacker can exhaust direct memory and cause the JVM to crash by sending crafted HTTP/2 DATA frames to applications that have HTTP/2 content decompression enabled via DelegatingDecompressorFrameListener.