CVE-2026-93579

Io.netty/netty-codec-http2: netty: http/2 header field values are not validated by default (cr/lf/nul passthrough)

Published Sep 18, 2026 CVSS 3.1 · 6.5 Medium EPSS 1.1% KEV · Not listed
Description
A flaw was found in Netty's HTTP/2 stack. This vulnerability allows a remote attacker to inject prohibited characters, such as NUL, Line Feed, and Carriage Return, into HTTP/2 header field values due to insufficient validation. When these values cross an HTTP/2 to HTTP/1.1 translation boundary, they can be exploited for request smuggling, header injection, or response splitting. This could lead to unauthorized access, data manipulation, or other security bypasses.

Remediation

Vendor Workaround

See https://github.com/netty/netty/security/advisories/GHSA-8whp-c7w8-2m72 for fixed versions and remediation guidance.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:/a:redhat:build_keycloak: cpe:/a:redhat:build_keycloak:26.4::el9
cpe:/a:redhat:build_keycloak:26.6::el9
References
Type Values Removed Values Added
First Time appeared Redhat jboss Enterprise Application Platform Xp
CPEs cpe:/a:redhat:jboss_enterprise_application_platform_xp:6.0
Vendors & Products Redhat jboss Enterprise Application Platform Xp
References
Type Values Removed Values Added
First Time appeared Redhat jbosseapxp
CPEs cpe:/a:redhat:jbosseapxp
Vendors & Products Redhat jbosseapxp
Type Values Removed Values Added
CPEs cpe:/a:redhat:debezium:3 cpe:/a:redhat:debezium:3.6
References
Type Values Removed Values Added
First Time appeared Redhat quarkus
CPEs cpe:/a:redhat:quarkus:3.27::el8
cpe:/a:redhat:quarkus:3.33::el8
Vendors & Products Redhat quarkus
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Io.netty
Io.netty netty-codec-http2
Redhat build Of Apache Camel For Quarkus
Redhat build Of Apache Camel For Spring Boot
Redhat build Of Apicurio Registry
Redhat build Of Debezium 3
Redhat build Of Keycloak
Redhat build Of Quarkus
Redhat data Grid 8
Redhat quay 3
Redhat single Sign-on
Vendors & Products Io.netty
Io.netty netty-codec-http2
Redhat build Of Apache Camel For Quarkus
Redhat build Of Apache Camel For Spring Boot
Redhat build Of Apicurio Registry
Redhat build Of Debezium 3
Redhat build Of Keycloak
Redhat build Of Quarkus
Redhat data Grid 8
Redhat quay 3
Redhat single Sign-on
Type Values Removed Values Added
CPEs cpe:/a:redhat:quarkus:3
Vendors & Products Redhat quarkus
References
Type Values Removed Values Added
Description A flaw was found in Netty's HTTP/2 stack. This vulnerability allows a remote attacker to inject prohibited characters, such as NUL, Line Feed, and Carriage Return, into HTTP/2 header field values due to insufficient validation. When these values cross an HTTP/2 to HTTP/1.1 translation boundary, they can be exploited for request smuggling, header injection, or response splitting. This could lead to unauthorized access, data manipulation, or other security bypasses.
Title Io.netty/netty-codec-http2: netty: http/2 header field values are not validated by default (cr/lf/nul passthrough)
First Time appeared Redhat
Redhat amq Broker
Redhat apicurio Registry
Redhat build Keycloak
Redhat camel Quarkus
Redhat camel Spring Boot
Redhat debezium
Redhat jboss Data Grid
Redhat jboss Enterprise Application Platform
Redhat jboss Fuse
Redhat quarkus
Redhat red Hat Single Sign On
Weaknesses CWE-1035
CPEs cpe:/a:redhat:amq_broker:7
cpe:/a:redhat:apicurio_registry:3
cpe:/a:redhat:build_keycloak:
cpe:/a:redhat:camel_quarkus:3
cpe:/a:redhat:camel_spring_boot:4
cpe:/a:redhat:debezium:3
cpe:/a:redhat:jboss_data_grid:8
cpe:/a:redhat:jboss_enterprise_application_platform:7
cpe:/a:redhat:jboss_enterprise_application_platform:8
cpe:/a:redhat:jboss_fuse:7
cpe:/a:redhat:quarkus:3
cpe:/a:redhat:red_hat_single_sign_on:7
Vendors & Products Redhat
Redhat amq Broker
Redhat apicurio Registry
Redhat build Keycloak
Redhat camel Quarkus
Redhat camel Spring Boot
Redhat debezium
Redhat jboss Data Grid
Redhat jboss Enterprise Application Platform
Redhat jboss Fuse
Redhat quarkus
Redhat red Hat Single Sign On
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}