Inconsistent interpretation of HTTP requests in Netty - CVE-2026-50020

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Main Vulnerability Database Vulnerabilities #VU133456

Inconsistent interpretation of HTTP requests in Netty - CVE-2026-50020

Published: June 8, 2026


Vulnerability identifier: #VU133456
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-2026-50020
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to smuggle HTTP requests.

The vulnerability exists due to inconsistent interpretation of HTTP requests in HttpObjectDecoder when parsing requests with non-CRLF control characters before the request-line. A remote attacker can send a specially crafted request to smuggle HTTP requests.

The issue can cause request-boundary confusion when a front-end component interprets the prepended bytes differently in pipelined or multiplexed transports.


Affected software

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
SUSE Package Hub 15
Development Tools Module
IBM SPSS Analytic Server
UCD - IBM UrbanCode Deploy
IBM Maximo Application Suite - Manage Component
DevOps Deploy
Maximo Application Suite - Monitor Component
webMethods ControlPlane
webMethods developer portal
IBM App Connect for Manufacturing
netty-tcnative
netty-tcnative-debugsource
netty
netty-javadoc

How to mitigate CVE-2026-50020

Install security update from vendor's website.

Netty - addressed in versions 4.1.135, 4.2.15
UCD - IBM UrbanCode Deploy - addressed in versions 7.2.3.25, 7.3.2.20
DevOps Deploy - addressed in versions 8.0.1.15, 8.1.2.8, 8.2.2.1
IBM Maximo Application Suite - Manage Component - addressed in versions 9.0.28, 9.1.20, 9.2.1
Maximo Application Suite - Monitor Component - addressed in versions 9.0.23, 9.1.13, 9.2.1
webMethods ControlPlane - update to 11.1 Fix11
webMethods developer portal - update to 11.1 Fix14
netty-tcnative - update to 2.0.79-150200.3.45.1
netty-tcnative-debugsource - update to 2.0.79-150200.3.45.1
netty - update to 4.1.135-150200.4.50.1
netty-javadoc - update to 4.1.135-150200.4.50.1

External References

Related Security Bulletins