Allocation of Resources Without Limits or Throttling The advisory has been revoked - it doesn't affect any version of package io.netty:netty-common (opens in a new tab)
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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Start learning- Snyk IDSNYK-JAVA-IONETTY-20074866
- published24 Sept 2026
- disclosed10 Sept 2026
- creditYazan Balawneh, Mike Read
Introduced: 10 Sep 2026
CVE-2026-93491 (opens in a new tab)How to fix?
Upgrade io.netty:netty-common to version 4.1.138.Final, 4.2.18.Final or higher.
Amendment
This was deemed not a vulnerability.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the enqueueMethod() method of HttpServerCodec, which packs the first 32 pipelined HTTP methods into a single long and then appends every further entry to the methodOverflowQueue ArrayDeque<Byte> with no size check. An attacker can exhaust the heap by pipelining a large number of minimal requests such as GET / HTTP/1.1\r\nHost: x\r\n\r\n on a single connection, with the growth coming from the codec's own per-connection bookkeeping rather than from buffered bodies. This requires the attacker to hold the connection open while withholding socket reads, so back pressure leaves responses unflushed and the decoder runs ahead of them, accumulating entries.