Allocation of Resources Without Limits or Throttling Affecting io.netty:netty-codec-http2 package, versions [,4.1.132.Final)[4.2.0.Alpha1,4.2.10.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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- published27 Mar 2026
- disclosed26 Mar 2026
- creditsprabhav7
Introduced: 26 Mar 2026
CVE-2026-33871 (opens in a new tab)How to fix?
Upgrade io.netty:netty-codec-http2 to version 4.1.132.Final, 4.2.10.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 through the verifyContinuationFrame function. An attacker can cause excessive CPU consumption and render the server unresponsive by sending a large number of zero-byte CONTINUATION frames, bypassing existing size-based mitigations.