---
id: CVE-2026-93564
title: A flaw was found in Netty
summary: >-
  A flaw was found in Netty. A reference-count leak in the HAProxy PROXY-v2
  message decoder allows a remote, unauthenticated attacker to send specially
  crafted PROXY-protocol v2 headers. This can lead to memory exhaustion,
  resulting in a D…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-1035
vendor: Red Hat
product: netty-codec-haproxy
affected:
  - netty-codec-haproxy (all versions)
  - netty-codec-haproxy (all versions)
  - netty-codec-haproxy (all versions)
  - netty-codec-haproxy (all versions)
  - netty-codec-haproxy (all versions)
  - netty-codec-haproxy (all versions)
  - netty-codec-haproxy (all versions)
  - netty-codec-haproxy (all versions)
  - netty-codec-haproxy (all versions)
published: '2026-09-18'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T17:17:30.177'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93564'
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/errata/RHSA-2026:70257'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-93564'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2536953'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93564.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-93564'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93564'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00793
epssPercentile: 0.54492
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-18T17:42:29.142695Z'
ingestedAt: '2026-09-18T14:43:13.071Z'
---

## Overview

A flaw was found in Netty. A reference-count leak in the HAProxy PROXY-v2 message decoder allows a remote, unauthenticated attacker to send specially crafted PROXY-protocol v2 headers. This can lead to memory exhaustion, resulting in a Denial of Service (DoS) for the affected system.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat AMQ Broker 7, 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, Red Hat Build of Keycloak, … · 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 2026-09-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93564.json)