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Advisory record · GHSA-4grm-h2qv-h6w6

Netty HTTP/3 QPACK Blocked Streams Memory Exhaustion

CVSS 7.5 HighEPSS 0.0039 · 33rd percentile

Published by the GitHub Advisory Database at 15 Jun 2026, 20:43 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty:netty-codec-http3Maven>=4.2.0.Final, <4.2.15.Final4.2.15.Final
Identifiers
GHSA-4grm-h2qv-h6w6 · CVE-2026-48748
Weakness (CWE)
CWE-770
Tags
Published
15 Jun 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Netty's netty-codec-http3 package, versions 4.2.0.Final up to but not including 4.2.15.Final, is vulnerable to memory exhaustion in its HTTP/3 QPACK decoder. A remote client can open an unlimited number of blocked streams when the server enables QPACK dynamic tables without explicitly setting the blocked streams limit, which defaults to 0. This can exhaust server memory and crash the JVM. Upgrade to 4.2.15.Final or later.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0039, the 33rd percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.