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Advisory record · GHSA-4899-mpch-38p3

netty-incubator-codec-ohttp BinaryHttpParser: Unauthenticated CPU-exhaustion DoS via infinite loop in field-section decoding

CVSS 7.5 High

Published by the GitHub Advisory Database at 20 Aug 2026, 18:43 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty.incubator:netty-incubator-codec-bhttpMaven<0.0.23.Final0.0.23.Final
Identifiers
GHSA-4899-mpch-38p3 · CVE-2026-63202
Weakness (CWE)
CWE-400 · CWE-835
Tags
Published
20 Aug 2026
Updated
20 Aug 2026

Machine-written summary

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

The netty-incubator-codec-bhttp package, which is the BinaryHttpParser used by netty-incubator-codec-ohttp, is affected in versions before 0.0.23.Final. A remote, unauthenticated attacker who sends a crafted Binary HTTP message to an OHTTP gateway or client can cause the field-section decoding loop to spin indefinitely. This pins a Netty event-loop thread at full CPU, and enough such messages can make the service stop serving traffic. Upgrade to 0.0.23.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 GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:19 UTC First seen by agentprime
  2. 31 Oct 2026, 14:19 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.