Inconsistent interpretation of HTTP requests in Netty - CVE-2026-42581

Vulnerability identifier: #VU130214

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-42581

CWE-ID: CWE-444

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform request smuggling.

The vulnerability exists due to improper input validation in HttpObjectDecoder when processing HTTP/1.0 requests containing both Transfer-Encoding: chunked and Content-Length headers. A remote attacker can send a specially crafted HTTP/1.0 request to perform request smuggling.

Exploitation requires Netty to be deployed behind a downstream proxy or handler that trusts Content-Length over Transfer-Encoding.

Netty
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
Ubuntu
Development Tools Module
SUSE Package Hub 15
IBM SPSS Analytic Server
Jira Service Management Data Center
Crowd Data Center
UCD - IBM UrbanCode Deploy
Jira Software Data Center
Red Hat OpenShift Dev Spaces
Red Hat Integration Camel Extensions for Quarkus
Enterprise Build of Quarkus
DevOps Deploy
Rational Performance Tester
DevOps Test Performance
IBM DB2
netty-tcnative-debugsource
netty-tcnative
netty (Ubuntu package)
netty-javadoc
netty

Install security update from vendor's website.

Netty - addressed in versions 4.1.133, 4.2.13
Enterprise Build of Quarkus - update to 3.27.4
Jira Service Management Data Center - addressed in versions 10.3.22, 11.3.7
Crowd Data Center - update to 7.2.1
UCD - IBM UrbanCode Deploy - addressed in versions 7.2.3.24, 7.3.2.19
DevOps Deploy - addressed in versions 8.0.1.14, 8.1.2.7, 8.2.2.0
Jira Software Data Center - addressed in versions 9.12.28, 10.3.22, 11.3.7
DevOps Test Performance - update to 11.0.8
netty-tcnative-debugsource - update to 2.0.77-150200.3.39.1
netty-tcnative - update to 2.0.77-150200.3.39.1
netty (Ubuntu package) - addressed in versions 1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1, 1:4.0.34-1ubuntu0.1~esm4, 1:4.1.7-4ubuntu0.1+esm6, 1:4.1.45-1ubuntu0.1~esm6, 1:4.1.48-4+deb11u2ubuntu0.1+esm3, 1:4.1.48-9ubuntu0.1+esm3, 1:4.1.48-16ubuntu0.1~esm2
Red Hat OpenShift Dev Spaces - update to 3.28.2
Red Hat Integration Camel Extensions for Quarkus - update to 3.33.2
netty-javadoc - update to 4.1.133-150200.4.46.1
netty - update to 4.1.133-150200.4.46.1

• https://github.com/netty/netty/security/advisories/GHSA-xxqh-mfjm-7mv9

• Multiple vulnerabilities in Netty
• Multiple vulnerabilities in IBM DevOps Test Performance
• Multiple vulnerabilities in IBM SPSS Analytic Server
• Ubuntu update for netty
• SUSE update for netty, netty-tcnative
• Multiple vulnerabilities in Red Hat Integration Camel Extensions for Quarkus 3.33
• Multiple vulnerabilities in IBM Enterprise Build of Quarkus
• Multiple vulnerabilities in Crowd Data Center
• Multiple vulnerabilities in IBM Db2
• Multiple vulnerabilities in Red Hat OpenShift Dev Spaces 3.28
• Multiple vulnerabilities in IBM DevOps Deploy / IBM UrbanCode Deploy (UCD)
• Multiple vulnerabilities in Jira Service Management Data Center
• Multiple vulnerabilities in Jira Software Data Center