---
id: CVE-2026-93566
title: A flaw was found in Netty
summary: >-
  A flaw was found in Netty. A remote attacker could exploit this by sending a
  specially crafted HTTP request that includes control characters within the
  chunk-size line. This bypasses the intended strict validation, allowing the
  attacker …
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-1035
vendor: Red Hat
product: netty-codec-http
affected:
  - netty-codec-http (all versions)
  - netty-codec-http (all versions)
  - netty-codec-http (all versions)
  - netty-codec-http (all versions)
  - netty-codec-http (all versions)
  - netty-codec-http (all versions)
  - netty-codec-http (all versions)
  - netty-codec-http (all versions)
  - netty-codec-http
  - netty-codec-http
  - netty-codec-http (all versions)
  - netty-codec-http
published: '2026-09-18'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T11:16:59.840'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93566'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:69440'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:69470'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-93566'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2536954'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93566.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-93566'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93566'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-22T14:28:28.241291Z'
epss: 0.00637
epssPercentile: 0.48255
ingestedAt: '2026-09-18T14:43:13.070Z'
---

## Overview

A flaw was found in Netty. A remote attacker could exploit this by sending a specially crafted HTTP request that includes control characters within the chunk-size line. This bypasses the intended strict validation, allowing the attacker to inject arbitrary HTTP requests. This vulnerability can lead to HTTP request smuggling, potentially resulting in information disclosure or other unauthorized actions.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat AMQ Broker 7, Red Hat AMQ Clients, Red Hat build of Apache Camel 4 for Quarkus 3, Red Hat build of Apache Camel for Spring Boot 4, Red Hat build of Apicurio Registry 3, Red Hat build of Debezium 3, … · no fix planned: Red Hat Fuse 7, Red Hat JBoss Enterprise Application Platform 7, Red Hat Single Sign-On 7, Red Hat AMQ Broker 7, … · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93566.json)