Netty netty-codec-haproxy 4.1.x/4.2.x Memory Leak via HAProxyMessage TLV
CVE-2026-44893 Published on June 12, 2026

Netty: HAProxy SSL TLV parsing leaks retained slice on invalid TLV length
Netty is a network application framework for development of protocol servers and clients. In netty-codec-haproxy prior to versions 4.1.135.Final and 4.2.15.Final, when decoding a PP2_TYPE_SSL TLV, HAProxyMessage.readNextTLV() first calls `header.retainedSlice(header.readerIndex(), length)` and only then reads the 1-byte client field and 4-byte verify field. If the attacker sets the TLV length below 5, the subsequent readByte/readInt throws IndexOutOfBoundsException. HAProxyMessageDecoder only catches HAProxyProtocolException around this call, so the IOOBE propagates and the retained slice on the pooled cumulation buffer is never released. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

NVD

Vulnerability Analysis

CVE-2026-44893 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

Improper Check or Handling of Exceptional Conditions

The software does not properly anticipate or handle exceptional conditions that rarely occur during normal operation of the software.

Buffer Access with Incorrect Length Value

The software uses a sequential operation to read or write a buffer, but it uses an incorrect length value that causes it to access memory that is outside of the bounds of the buffer. When the length value exceeds the size of the destination, a buffer overflow could occur.


Products Associated with CVE-2026-44893

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2026-44893 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 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 OpenShift Dev Spaces: 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.