CVE-2026-93562

Io.netty/netty-codec-http: netty: incomplete validation of malformed transfer-encoding allows http request smuggling

publishedCWE-1035

A flaw was found in Netty's HTTP/1 decoder. Incomplete validation of malformed Transfer-Encoding headers allows a remote attacker to perform HTTP request smuggling. By sending specially crafted HTTP requests, an attacker can inject arbitrary HTTP requests, potentially bypassing security controls or accessing unauthorized resources.

Technical severity6.5 mediumCVSS 3.1 · CNA: redhat

Published2026-09-18Source updated 2026-11-06

Collected2026-11-062 attributed sources

Fixes and workarounds

Workaround

See https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c for fixed versions and remediation guidance.

Source: CNA: redhat

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
Red Hat Build of Debezium 3.6 Red Hat `netty-codec-http` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat build of Keycloak 26.4 Red Hat `keycloak-rhel9-container` https://catalog.redhat.com/software/containers/	≥ 26.4-29; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat build of Keycloak 26.4 Red Hat `keycloak-rhel9-operator-bundle-container` https://catalog.redhat.com/software/containers/	≥ 26.4.17-2; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat build of Keycloak 26.4 Red Hat `keycloak-rhel9-operator-container` https://catalog.redhat.com/software/containers/	≥ 26.4-30; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat build of Keycloak 26.6.8 Red Hat `netty-codec-http` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat build of Quarkus 3.27.5.SP2 Red Hat `netty-codec-http` https://access.redhat.com/jbossnetwork/restricted/listSoftware.html	Range not reported Other versions: unaffected	CNA: redhat
Red Hat build of Quarkus 3.33.3.SP2 Red Hat `netty-codec-http` https://access.redhat.com/jbossnetwork/restricted/listSoftware.html	Range not reported Other versions: unaffected	CNA: redhat
Red Hat AMQ Broker 7 Red Hat `netty-codec-http` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat AMQ Clients Red Hat `netty-codec-http` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat build of Apache Camel 4 for Quarkus 3 Red Hat `netty-codec-http` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat build of Apache Camel for Spring Boot 4 Red Hat `netty-codec-http` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat build of Apicurio Registry 3 Red Hat `netty-codec-http` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Data Grid 8 Red Hat `netty-codec-http` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Fuse 7 Red Hat `netty-codec-http` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unknown	CNA: redhat
Red Hat JBoss Enterprise Application Platform 7 Red Hat `netty-codec-http` https://access.redhat.com/jbossnetwork/restricted/listSoftware.html	Range not reported Other versions: unknown	CNA: redhat
Red Hat JBoss Enterprise Application Platform 8 Red Hat `netty-codec-http` https://access.redhat.com/jbossnetwork/restricted/listSoftware.html	Range not reported Other versions: affected	CNA: redhat
Red Hat Single Sign-On 7 Red Hat `netty-codec-http` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unknown	CNA: redhat

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 6.5 medium	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`	CNA: redhat

Exploit evidence

https://bugzilla.redhat.com/show_bug.cgi?id=2536951
exploit · ADP: CISA-ADP

References

https://access.redhat.com/errata/RHSA-2026:69440CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:69470CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:83612CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:95760CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:95761CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-93562CNA: redhat · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2536951CNA: redhat · issue-tracking, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2536951ADP: CISA-ADP · exploit

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