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Fencer Vulns
medium 5.5

CVE-2026-59919 json

Netty: HAProxy V1 Protocol CRLF Injection via AF_UNIX Address

published 2026-07-22 3 mo ago modified 2026-09-10 1 mo ago also EUVD-2026-50438 , GHSA-wh89-7897-x99h

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 5%
public exploits
0
none known

Summary

Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.136.Final and 4.2.16.Final, Netty's HAProxy encoder ( HAProxyMessageEncoder ) writes AF_UNIX source and destination socket addresses into the HAProxy V1 text protocol without validating them for CRLF characters, so an attacker who controls an AF_UNIX address can inject  \r\n  sequences and split the single PROXY header into multiple lines. This is possible because the V1 protocol uses CRLF as its line terminator and, unlike IPv4/IPv6 addresses whose format checks implicitly reject CRLF, AF_UNIX addresses are only validated for length (up to 108 bytes), allowing a forged second PROXY header line that spoofs the client source/destination IP to a downstream server or load balancer. The issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

Patch / fix

  • maven io.netty:netty-codec-haproxy 4.1.136.Final, 4.2.16.Final
  • io.netty netty-codec-haproxy 4.1.136.Final, 4.2.16.Final
  • netty netty 4.1.136.Final, 4.2.16.Final
  • netty-tcnative SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 2.0.80-150200.3.48.1
  • netty SLE Module for Package Hub 15 SP7 4.1.136-150200.4.53.1

suse advisories SUSE-SU-2026:3482-1

  • netty openSUSE Tumbleweed 4.1.136-1.1

opensuse advisories openSUSE-SU-2026:11394-1

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-2026-59919 updated cvss 5.5

io.netty/netty-codec-haproxy: Netty: Improper CR/LF neutralization in netty-codec-haproxy

  • Red Hat Cryostat 4 netty-codec-haproxy 4.1.132.Final-redhat-00001 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 AMQ Broker 7 netty-codec-haproxy 4.1.132.Final-redhat-00001 Red Hat build of Apache Camel - HawtIO 4 netty-codec-haproxy 4.1.132.Final-redhat-00001 Red Hat build of Apache Camel 4 for Quarkus 3 netty-codec-haproxy 4.1.132.Final-redhat-00001 Red Hat build of Apache Camel for Spring Boot 4 netty-codec-haproxy 4.1.132.Final-redhat-00001
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Apicurio Registry 3 netty-codec-haproxy 4.1.132.Final-redhat-00001
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat build of Debezium 3 netty-codec-haproxy 4.1.132.Final-redhat-00001 Red Hat Build of Keycloak rhbk-keycloak-rhel9, rhbk-rhel9-operator, rhbk-openshift-rhel9, rhbk-keycloak-rhel9-operator, netty-codec-haproxy 4.1.132.Final-redhat-00001
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Quarkus netty-codec-haproxy 4.1.132.Final-redhat-00001
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Data Grid 8 netty-codec-haproxy 4.1.132.Final-redhat-00001
    affected: workaround, no fix available “Fix deferred”
  • Red Hat JBoss Enterprise Application Platform 7 eap74-els-openjdk8-openshift-rhel8, eap74-els-openjdk11-openshift-rhel8, eap74-els-openjdk17-openshift-rhel8, jboss-eap-7-eap74-els-openjdk8-openshift-rhel8, netty-codec-haproxy 4.1.132.Final-redhat-00001, jboss-eap-7-eap74-els-openjdk17-openshift-rhel8
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat JBoss Enterprise Application Platform Expansion Pack netty-codec-haproxy 4.1.132.Final-redhat-00001 Red Hat OpenShift AI (RHOAI) rhoai/odh-trustyai-service-rhel9 Red Hat OpenShift Dev Spaces devspaces/multicluster-redirector-rhel9 Red Hat Satellite 6 candlepin, candlepin-selinux
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Single Sign-On 7 netty-codec-haproxy 4.1.132.Final-redhat-00001 Red Hat streams for Apache Kafka 2 netty-codec-haproxy 4.1.132.Final-redhat-00001
    affected: workaround, no fix planned “Out of support scope”
show 1 more
  • Red Hat streams for Apache Kafka 3 netty-codec-haproxy 4.1.132.Final-redhat-00001
    affected: workaround, no fix available “Fix deferred”

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
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/netty/netty/security/advisories/GHSA-wh89-7897-x99h referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
GitHub 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
maven io.netty:netty-codec-haproxy
>=4.2.0.Final, <4.2.16.Final
<4.1.136.Final
4.2.16.Final
4.1.136.Final

Affected products

  • netty netty

Classification

Weakness
  • CWE-93 Improper Neutralization of CRLF Sequences

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.