Low 2.9Published May 13, 2026

CVE-2026-42578Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation

Updated under an hour ago (Oct 27, 2026, 5:50 AM ET)

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It affects netty and 24 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for netty

Exploited in the last 30 days

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's HttpProxyHandler constructs HTTP CONNECT requests with header validation explicitly disabled. The newInitialMessage() method creates headers using DefaultHttpHeadersFactory.headersFactory().withValidation(false), then adds user-provided outboundHeaders without any CRLF validation. This allows an attacker who can influence the outbound headers to inject arbitrary HTTP headers into the CONNECT request sent to the proxy server. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

CVSS: 2.9 LOW (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
Weakness (CWE): CWE-113, CWE-93
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Sep 18, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

netty netty netty:netty (from the name)	from 4.2.0.Alpha1, < 4.2.13.Final; before 4.1.133.Final	CNA record
Red Hat Cryostat 4 on RHEL 9 redhat:cryostat	from 4.2.0-10 not affected	CISA ADP
Red Hat Red Hat AMQ Broker 7.13.6 redhat:amq_broker	from handler-proxy not affected	CISA ADP
Red Hat Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16 redhat:apache_camel_spring_boot	from handler-proxy not affected	CISA ADP
Red Hat Red Hat build of Quarkus 3.27.4 redhat:quarkus	from handler-proxy not affected	CISA ADP
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 redhat:jboss_enterprise_application_platform_els	from 0:2.16.0-22.redhat_00057.1.el7eap not affected	CISA ADP
Red Hat Red Hat JBoss Enterprise Application Platform 8.1.7.GA redhat:jboss_enterprise_application_platform	from 4.1.135.Final-redhat-00001 not affected	CISA ADP
Red Hat Streams for Apache Kafka 3.2.1 redhat:amq_streams	from handler-proxy not affected	CISA ADP
Red Hat Red Hat OpenShift AI 2.25 redhat:openshift_ai	from 1783443816 not affected	CISA ADP
Red Hat Red Hat OpenShift Dev Spaces 3.28 redhat:openshift_devspaces	from 1780948325 not affected	CISA ADP
1–10 of 26

References

References

https://github.com/netty/netty/security/advisories/GHSA-45q3-82m4-75jr	x-refsource-confirm, exploit, mitigation, vendor-advisory
https://access.redhat.com/errata/RHSA-2026:23808
https://access.redhat.com/errata/RHSA-2026:24502
https://access.redhat.com/errata/RHSA-2026:25123
https://access.redhat.com/errata/RHSA-2026:28010
https://access.redhat.com/errata/RHSA-2026:36820
https://access.redhat.com/errata/RHSA-2026:37390
https://access.redhat.com/errata/RHSA-2026:42644
https://access.redhat.com/errata/RHSA-2026:49700
https://access.redhat.com/errata/RHSA-2026:49701
1–10 of 20

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.