Netty <4.1.135 / <4.2.15 HAProxy PROXY v2 codec memory leak (PP2_TYPE_SSL)
CVE-2026-48059 Published on June 12, 2026

Netty HAProxy: Unbalanced Reference Count in Nested PP2_TYPE_SSL TLV Parsing Leads to Memory Exhaustion
Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, the HAProxy PROXY protocol v2 codec in netty leaks native or heap memory on every connection when a client sends a syntactically valid header containing nested `PP2_TYPE_SSL` TLVs (type-length-value records) at depth two or greater. The leak occurs on the successful parse path no exception is thrown, the message fires downstream, the decoder removes itself, and the application releases the `HAProxyMessage` normally. Yet the underlying cumulation buffer (a pooled, potentially direct `ByteBuf` allocated by the channel) remains permanently pinned. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

NVD

Vulnerability Analysis

CVE-2026-48059 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Weakness Types

What is a Memory Leak Vulnerability?

The software does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. This is often triggered by improper handling of malformed data or unexpectedly interrupted sessions. In some languages, developers are responsible for tracking memory allocation and releasing the memory. If there are no more pointers or references to the memory, then it can no longer be tracked and identified for release.

CVE-2026-48059 has been classified to as a Memory Leak vulnerability or weakness.

Improper Validation of Syntactic Correctness of Input

The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax.


Products Associated with CVE-2026-48059

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2026-48059 are published in these products:

Netty
 
Red Hat Apache Camel Quarkus
 
Red Hat Quarkus
 
Red Hat Cryostat
 
Red Hat Serverless
 
Red Hat Amq Broker
 
Red Hat Apache Camel Hawtio
 
Red Hat Camel Quarkus
 
Red Hat Camel Spring Boot
 
Red Hat Apicurio Registry
 
Red Hat Debezium
 
Red Hat Build Keycloak
 
Red Hat Jboss Data Grid
 
Red Hat Jboss Fuse
 
Red Hat Jboss Enterprise Application Platform
 
Red Hat Jbosseapxp
 
Red Hat Openshift Ai
 
Red Hat Openshift Devspaces
 
Red Hat Amq Streams
 
Red Hat Satellite
 
Red Hat Single Sign On
 
Red Hat Kafka
 

Affected Versions

netty: Red Hat Build of Apache Camel 3.33 for Quarkus 3.33.2.SP1: Red Hat OpenShift Dev Spaces 3.29: Red Hat build of Quarkus 3.27.4.SP1: Red Hat build of Quarkus 3.33.2.SP1: Red Hat Streams for Apache Kafka 2.9.4: Red Hat Cryostat 4: Red Hat OpenShift Serverless: Red Hat AMQ Broker 7: Red Hat build of Apache Camel - HawtIO 4: 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: Red Hat Data Grid 8: Red Hat Fuse 7: Red Hat JBoss Enterprise Application Platform 7: Red Hat JBoss Enterprise Application Platform Expansion Pack: Red Hat OpenShift AI (RHOAI): Red Hat streams for Apache Kafka 3: Red Hat Satellite 6: Red Hat Single Sign-On 7:

Exploit Probability

EPSS
0.61%
Percentile
44.45%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.