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High, CVSS 7.5amended

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

CVE-2026-63202GHSA-4899-mpch-38p3

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (io.netty.incubator:netty-incubator-codec-bhttp 0.0.23.Final), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

BinaryHttpParser: Unauthenticated CPU-exhaustion DoS via infinite loop in field-section decoding - ID: BHTTP-LOOP-001 - Severity: High - CVSS v3.1: 7.5 — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CWE: CWE-835 (Loop with Unreachable Exit Condition) — secondary CWE-400 (Uncontrolled Resource Consumption) - Affected component: codec-bhttp → io.netty.incubator.codec.bhttp.BinaryHttpParser#readFieldSection, file codec-bhttp/src/main/java/io/netty/incubator/codec/bhttp/BinaryHttpParser.java:619-626 - Affected version: netty-incubator-codec-ohttp HEAD d3f2b49 (release 0.0.22.Final + 3 commits). The loop has existed since the parser was introduced and is present in the latest code; all published advisory fixes are already applied. - Reachable from: io.netty.incubator.codec.ohttp.OHttpRequestResponseContext$ContentDecoder#decodeChunk (codec-ohttp/.../OHttpRequestResponseContext.java:214), i.e. the auto-wired OHTTP server and client codecs. - Confidence: High (empirically reproduced hang…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-4899-mpch-38p3

  2. Revision 1 · created ·

    Published from osv record GHSA-4899-mpch-38p3

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-63202

Advisory: netty-incubator-codec-ohttp BinaryHttpParser: Unauthenticated CPU-exhaustion DoS via infinite loop in field-section decoding
IDs: CVE-2026-63202, GHSA-4899-mpch-38p3
Record: https://patchnext.com/advisories/cve-2026-63202 (revision 2, source checked 26 Oct 2026, 16:55 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: io.netty.incubator:netty-incubator-codec-bhttp 0.0.23.Final. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven io.netty.incubator:netty-incubator-codec-bhttp: affected <= 0.0.22.Final; fixed in 0.0.23.Final

## Suggested inspection (read-only)
- Maven io.netty.incubator:netty-incubator-codec-bhttp: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on io.netty.incubator:netty-incubator-codec-bhttp.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-4899-mpch-38p3 (OSV record GHSA-4899-mpch-38p3 lists affected ranges: Maven io.netty.incubator:netty-incubator-codec-bhttp >=0 <0.0.23.Final (fixed))
- Verified: https://github.com/advisories/GHSA-4899-mpch-38p3 (GitHub-reviewed advisory GHSA-4899-mpch-38p3 lists affected ranges: Maven io.netty.incubator:netty-incubator-codec-bhttp >=0 <=0.0.22.Final)

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