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Advisory record · GHSA-hqqc-jr88-p6x2

Netty QUIC hash collision DoS attack

CVSS 5.3 MediumEPSS 0.0059 · 48th percentile

Published by the GitHub Advisory Database at 31 Mar 2025, 21:47 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty.incubator:netty-incubator-codec-quicMaven<0.0.71.Final0.0.71.Final
Identifiers
GHSA-hqqc-jr88-p6x2 · CVE-2025-29908
Weakness (CWE)
CWE-407
Tags
Published
31 Mar 2025
Updated
31 Mar 2025

Machine-written summary

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

Netty QUIC codec (io.netty.incubator:netty-incubator-codec-quic) versions before 0.0.71.Final are affected by a hash collision flaw in the hash map used to track connections. A remote attacker can open connections with colliding Source Connection IDs, causing considerable CPU load on the server (a hash-flooding denial of service). Upgrade to 0.0.71.Final or later. The source gives few details on workarounds.

Written 7 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
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0059, the 48th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:11 UTC First seen by agentprime
  2. 31 Oct 2026, 15:11 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.