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Fencer Vulns
high 7.5

CVE-2026-44893 json

Netty: HAProxy SSL TLV parsing leaks retained slice on invalid TLV length

published 2026-06-08 5 mo ago modified 2026-09-18 52 d ago also EUVD-2026-36432 , GHSA-cc37-9q2j-3hfv

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven io.netty:netty-codec-haproxy 4.1.135.Final, 4.2.15.Final
  • Red Hat Cryostat 4 on RHEL 9 4.2.0-13
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 0:1.5.26-2.Final_redhat_00001.1.el7eap, 0:1.10.0-46.Final_redhat_00044.1.el7eap, 0:2.2.40-2.SP3_redhat_00001.1.el7eap, 0:2.3.14-11.SP11_redhat_00001.1.el7eap, 0:2.5.5-24.SP12_redhat_00016.1.el7eap, 0:2.5.5-30.SP12_redhat_00020.1.el7eap, 0:2.16.0-22.redhat_00057.1.el7eap, 0:2.18.8-1.redhat_00003.1.el7eap, 0:4.1.135-1.Final_redhat_00001.1.el7eap, 0:5.0.31-3.SP2_redhat_00001.1.el7eap, 0:7.4.25-2.GA_redhat_00001.1.el7eap
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8 0:1.5.26-2.Final_redhat_00001.1.el8eap, 0:1.10.0-46.Final_redhat_00044.1.el8eap, 0:2.2.40-1.SP3_redhat_00001.1.el8eap, 0:2.3.14-11.SP11_redhat_00001.1.el8eap, 0:2.5.5-24.SP12_redhat_00016.1.el8eap, 0:2.5.5-30.SP12_redhat_00020.1.el8eap, 0:2.16.0-22.redhat_00057.1.el8eap, 0:2.18.8-1.redhat_00003.1.el8eap, 0:4.1.135-1.Final_redhat_00001.1.el8eap, 0:5.0.31-3.SP2_redhat_00001.1.el8eap, 0:7.4.25-2.GA_redhat_00001.1.el8eap
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9 0:1.5.26-2.Final_redhat_00001.1.el9eap, 0:1.10.0-46.Final_redhat_00044.1.el9eap, 0:2.2.40-1.SP3_redhat_00001.1.el9eap, 0:2.3.14-11.SP11_redhat_00001.1.el9eap, 0:2.5.5-24.SP12_redhat_00016.1.el9eap, 0:2.5.5-30.SP12_redhat_00020.1.el9eap, 0:2.16.0-22.redhat_00057.1.el9eap, 0:2.18.8-1.redhat_00003.1.el9eap, 0:4.1.135-1.Final_redhat_00001.1.el9eap, 0:5.0.31-3.SP2_redhat_00001.1.el9eap, 0:7.4.25-2.GA_redhat_00001.1.el9eap
  • Red Hat Red Hat OpenShift AI 2.25 1788198681
  • Red Hat Red Hat OpenShift Dev Spaces 3.29 1782989027
  • rh-sso7-keycloak red hat single sign on 7.6 18.0.20-1.redhat_00001.1.el8sso
  • rh-sso7-keycloak-server red hat single sign on 7.6 18.0.20-1.redhat_00001.1.el8sso
  • rh-sso7-keycloak red hat single sign on 7.6 18.0.20-1.redhat_00001.1.el9sso
  • rh-sso7-keycloak-server red hat single sign on 7.6 18.0.20-1.redhat_00001.1.el9sso
  • rh-sso7-keycloak red hat single sign on 7.6 18.0.20-1.redhat_00001.1.el7sso
  • rh-sso7-keycloak-server red hat single sign on 7.6 18.0.20-1.redhat_00001.1.el7sso
  • eap7-netty jboss enterprise application platform els 7.4 4.1.135-1.Final_redhat_00001.1.el8eap
  • eap7-wildfly jboss enterprise application platform els 7.4 7.4.25-2.GA_redhat_00001.1.el8eap

red hat advisories RHSA-2026:76129RHSA-2026:76130RHSA-2026:76128RHSA-2026:53645RHSA-2026:53646RHSA-2026:53644

  • netty-tcnative SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 2.0.79-150200.3.45.1
  • netty SLE Module for Package Hub 15 SP7 4.1.135-150200.4.50.1

suse advisories SUSE-SU-2026:2802-1

  • netty openSUSE Tumbleweed 4.1.135-1.1

opensuse advisories openSUSE-SU-2026:11033-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-44893 updated cvss 7.5

netty-codec-haproxy: Netty-codec-haproxy: Denial of Service via malformed HAProxy message

  • Red Hat OpenShift Serverless openshift-serverless-1/kn-ekb-receiver-rhel9, openshift-serverless-1/kn-ekb-dispatcher-rhel9, openshift-serverless-1/kn-eventing-integrations-log-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sns-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sqs-sink-rhel9, +4 more Red Hat build of Apache Camel - HawtIO 4 netty-codec-haproxy Red Hat build of Apache Camel 4 for Quarkus 3 netty-codec-haproxy Red Hat build of Apicurio Registry 3 netty-codec-haproxy
    affected: workaround, no fix available
  • Red Hat build of Debezium 3 netty-codec-haproxy
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Build of Keycloak netty-codec-haproxy, rhbk/keycloak-rhel9, rhbk-openshift-rhel9
    affected: workaround, no fix available
  • Red Hat Fuse 7 netty-codec-haproxy
    affected: workaround, no fix planned “Will not fix”
  • Red Hat JBoss Enterprise Application Platform 7 netty-codec-haproxy
    affected: workaround, no fix available
  • Red Hat Cryostat 4 on RHEL 9 cryostat/cryostat-rhel9 4.2.0-13, cryostat/jfr-datasource-rhel9 4.2.0-13, cryostat/cryostat-reports-rhel9 4.2.0-13
    fixed: vendor fix RHSA-2026:48151
  • Red Hat Middleware Containers for OpenShift rh-sso-7/sso76-openshift-rhel8 7.6-85
    fixed: vendor fix RHSA-2026:76134
  • Red Hat AMQ Broker 7.14.1
    fixed: vendor fix RHSA-2026:66488
show 24 more
  • Red Hat Build of Apache Camel 3.33.2.SP1 netty-codec-haproxy 4.1.135.Final-redhat-00001
    fixed: vendor fix RHSA-2026:26586
  • Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16
    fixed: vendor fix RHSA-2026:37390
  • Red Hat build of Keycloak 26.4.13
    fixed: vendor fix RHSA-2026:30049
  • Red Hat build of Keycloak 26.6.4
    fixed: vendor fix RHSA-2026:30083
  • Red Hat build of Quarkus 3.27.4.SP1 netty-codec-haproxy 4.1.135.Final-redhat-00001
    fixed: vendor fix RHSA-2026:26018
  • Red Hat build of Quarkus 3.33.2.SP1 netty-codec-haproxy 4.1.135.Final-redhat-00001
    fixed: vendor fix RHSA-2026:26017
  • Red Hat Data Grid 8.6.2
    fixed: vendor fix RHSA-2026:41951
  • Red Hat JBoss EAP 7.4 ELS for RHEL 7 Server eap7-wildfly 7.4.25-2.GA_redhat_00001.1.el7eap, eap7-jackson-core 2.18.8-1.redhat_00003.1.el7eap, eap7-netty 4.1.135-1.Final_redhat_00001.1.el7eap, eap7-undertow 2.2.40-2.SP3_redhat_00001.1.el7eap, eap7-jackson-databind 2.18.8-1.redhat_00003.1.el7eap, eap7-netty-all 4.1.135-1.Final_redhat_00001.1.el7eap, +78 more
    fixed: vendor fix RHSA-2026:53644
  • Red Hat JBoss Enterprise Application Platform 7.4.25
    fixed: vendor fix RHSA-2026:53806
  • Red Hat OpenShift AI 2.25 rhoai/odh-trustyai-service-rhel9 1788198681
    fixed: vendor fix RHSA-2026:65126
  • Red Hat OpenShift AI 3.4 rhoai/odh-trustyai-service-rhel9 1791792525
    fixed: vendor fix RHSA-2026:84734
  • Red Hat OpenShift Dev Spaces 3.29 devspaces/multicluster-redirector-rhel9 1782989027
    fixed: vendor fix RHSA-2026:36820
  • Red Hat Single Sign-On 7.6 for RHEL 7 Server rh-sso7-keycloak 18.0.20-1.redhat_00001.1.el7sso, rh-sso7-keycloak-server 18.0.20-1.redhat_00001.1.el7sso
    fixed: vendor fix RHSA-2026:76128
  • Red Hat Single Sign-On 7.6 for RHEL 8 rh-sso7-keycloak 18.0.20-1.redhat_00001.1.el8sso, rh-sso7-keycloak-server 18.0.20-1.redhat_00001.1.el8sso
    fixed: vendor fix RHSA-2026:76129
  • Red Hat Single Sign-On 7.6 for RHEL 9 rh-sso7-keycloak 18.0.20-1.redhat_00001.1.el9sso, rh-sso7-keycloak-server 18.0.20-1.redhat_00001.1.el9sso
    fixed: vendor fix RHSA-2026:76130
  • Red Hat Single Sign-On 7.6.13
    fixed: vendor fix RHSA-2026:76132
  • Red Hat Streams for Apache Kafka 2.9.4
    fixed: vendor fix RHSA-2026:34608
  • Red Hat Streams for Apache Kafka 3.2.1
    fixed: vendor fix RHSA-2026:54435
  • Red Hat Cryostat 4 on RHEL 9 cryostat/cryostat-db-rhel9 4.2.0-19, cryostat/cryostat-storage-rhel9 4.2.0-19, cryostat/cryostat-rhel9-operator 4.2.0-18, cryostat/cryostat-operator-bundle 4.2.0-11, cryostat/cryostat-agent-init-rhel9 0.7.0-11, cryostat/cryostat-grafana-dashboard-rhel9 4.2.0-13, +1 more Red Hat Build of Apache Camel 3.33.2.SP1 jimfs 1.1, jna 5.8.0, bcel 6.7.0, bson 5.6.4, gax 2.74.1, icu4j 78.2, +1630 more
    not affected: vulnerable code not present
  • Red Hat Build of Keycloak rhbk-rhel9-operator, rhbk/keycloak-rhel9-operator
    not affected: vulnerable code not in execute path
  • Red Hat build of Quarkus 3.27.4.SP1 jna 5.8.0, db2 1.21.4, h2 2.3.230, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, +1009 more Red Hat build of Quarkus 3.33.2.SP1 jna 5.8.0, bson 5.6.4, h2 2.4.240, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, +1018 more
    not affected: vulnerable code not present
  • Red Hat JBoss Enterprise Application Platform 8 netty-codec Red Hat JBoss Enterprise Application Platform Expansion Pack netty-codec-haproxy
    not affected: component not present
  • Red Hat OpenShift AI 2.25 rhoai/odh-rhel9-operator 1788331391, rhoai/odh-vllm-cpu-rhel9 1786712073, rhoai/odh-dashboard-rhel9 1788312226, rhoai/odh-modelmesh-rhel9 1788319539, rhoai/odh-operator-bundle 1788332816, rhoai/odh-vllm-cuda-rhel9 1786710989, +70 more Red Hat OpenShift AI 3.4 rhoai/odh-cli-rhel9 1791509689, rhoai/rhai-cli-rhel9 1791509689, rhoai/odh-automl-rhel9 1791535789, rhoai/odh-mlflow-rhel9 1791865967, rhoai/odh-autorag-rhel9 1791557539, rhoai/odh-trainer-rhel9 1791869783, +99 more Red Hat OpenShift Dev Spaces 3.29 devspaces/udi-rhel9 1782991491, devspaces/code-rhel9 1782498475, devspaces/server-rhel9 1783033397, devspaces/openvsx-rhel9 1783007534, devspaces/traefik-rhel9 1782403274, devspaces/udi-base-rhel9 1782987705, +10 more
    not affected: vulnerable code not present
  • Red Hat Satellite 6 candlepin, candlepin-selinux
    not affected: vulnerable code not in execute path

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.62% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven io.netty:netty-codec-haproxy
>=4.2.0.Final, <4.2.15.Final
<4.1.135.Final
4.2.15.Final
4.1.135.Final

Affected products

  • netty netty
  • Red Hat Cryostat 4 on RHEL 9
  • Red Hat Red Hat AMQ Broker 7.14.1
  • Red Hat Red Hat Build of Apache Camel 3.33 for Quarkus 3.33.2.SP1
  • Red Hat Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16
  • Red Hat Red Hat build of Quarkus 3.27.4.SP1
  • Red Hat Red Hat build of Quarkus 3.33.2.SP1
  • Red Hat Red Hat Data Grid 8.6.2
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1
  • Red Hat Streams for Apache Kafka 2.9.4
  • Red Hat Streams for Apache Kafka 3.2.1
  • Red Hat Red Hat OpenShift AI 2.25
  • Red Hat Red Hat OpenShift Dev Spaces 3.29
  • Red Hat OpenShift Serverless
  • Red Hat Red Hat build of Apache Camel 4 for Quarkus 3
  • Red Hat Red Hat build of Apache Camel - HawtIO 4
  • Red Hat Red Hat build of Apicurio Registry 3
  • Red Hat Red Hat build of Debezium 3
  • Red Hat Red Hat Build of Keycloak
  • Red Hat Red Hat Fuse 7
  • Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack
  • Red Hat Red Hat Satellite 6
  • Red Hat Red Hat Single Sign-On 7

Classification

Weakness
  • CWE-703 Improper Check or Handling of Exceptional Conditions
  • CWE-805 Buffer Access with Incorrect Length Value
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.