Connect your agent
AdvisoriesCriticalCheck your lockfilePluginHow it worksPricing Connect your agent

Advisory record · GHSA-cq4q-cv5g-r8q5

Netty: QUIC stateless reset token material exposed through header-visible connection IDs

CVSS 4.8 MediumEPSS 0.0020 · 10th percentile

Published by the GitHub Advisory Database at 15 Jun 2026, 20:44 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty:netty-codec-classes-quicMaven>=4.2.0.Final, <4.2.15.Final4.2.15.Final
Identifiers
GHSA-cq4q-cv5g-r8q5 · CVE-2026-50009
Weakness (CWE)
CWE-200 · CWE-330
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 io.netty:netty-codec-classes-quic versions 4.2.0.Final through 4.2.14.Final are affected when using the default HMAC-based connection ID and stateless reset token generators. An on-path attacker who can observe QUIC headers can derive the stateless reset token for the server's current connection ID and send a spoofed Stateless Reset packet to force the client side of the connection closed, causing denial of service. Upgrade to 4.2.15.Final.

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
4.8 Medium 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0020, the 10th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 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.