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Advisory record · GHSA-prj3-ccx8-p6x4

Netty affected by MadeYouReset HTTP/2 DDoS vulnerability

CVSS 8.2 HighEPSS 0.011 · 66th percentile

Published by the GitHub Advisory Database at 13 Aug 2025, 19:06 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty:netty-codec-http2Maven>=4.2.0.Alpha1, <4.2.4.Final || <4.1.124.Final4.2.4.Final, 4.1.124.Final
io.grpc:grpc-netty-shadedMaven<1.75.01.75.0
Identifiers
GHSA-prj3-ccx8-p6x4 · CVE-2025-55163
Weakness (CWE)
CWE-770
Tags
Published
13 Aug 2025
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-http2 is affected in versions from 4.2.0.Alpha1 before 4.2.4.Final and in versions before 4.1.124.Final; upgrade to 4.2.4.Final or 4.1.124.Final. grpc-netty-shaded versions before 1.75.0 are also affected; upgrade to 1.75.0. A remote client can send malformed HTTP/2 control frames that cause the server to reset streams while still processing them, which lets the attacker exhaust CPU or memory and cause denial of service. The source gives few details on specific workarounds beyond protocol-level limits on server-sent reset frames.

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
8.2 High 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.011, the 66th percentile, on 13 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.