Description
A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2 :authority field, discarding the original request-target authority. This inconsistency can allow an attacker to bypass security controls in Netty-based proxies or gateways, potentially leading to unauthorized access, cache poisoning, or misrouting of requests.
Published: 2026-09-18
Score: 8.2 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Workaround

See https://github.com/netty/netty/security/advisories/GHSA-cg2g-fxr4-mg8m for fixed versions and remediation guidance.

Tracking

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Advisories

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History

Mon, 21 Sep 2026 17:00:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:quarkus:3
Vendors & Products Redhat quarkus
References

Sat, 19 Sep 2026 23:00:00 +0000

Type Values Removed Values Added
First Time appeared Io.netty
Io.netty netty-codec-http
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
Vendors & Products Io.netty
Io.netty netty-codec-http
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

Sat, 19 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Fri, 18 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Description HTTP/1 absolute-form Host mismatch is translated to HTTP/2 :authority, overriding the request-target authority A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2 :authority field, discarding the original request-target authority. This inconsistency can allow an attacker to bypass security controls in Netty-based proxies or gateways, potentially leading to unauthorized access, cache poisoning, or misrouting of requests.

Fri, 18 Sep 2026 14:45:00 +0000

Type Values Removed Values Added
Description HTTP/1 absolute-form Host mismatch is translated to HTTP/2 :authority, overriding the request-target authority
Title Io.netty/netty-codec-http2: http/1 absolute-form host mismatch is translated to http/2 :authority, overriding the request-target authority
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-444
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': 8.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N'}


Subscriptions

Io.netty Netty-codec-http
Redhat Amq Broker Apicurio Registry Build Keycloak Build Of Apache Camel For Quarkus Build Of Apache Camel For Spring Boot Build Of Apicurio Registry Build Of Debezium 3 Build Of Keycloak Build Of Quarkus Camel Quarkus Camel Spring Boot Data Grid 8 Debezium Jboss Data Grid Jboss Enterprise Application Platform Jboss Fuse Quay 3 Red Hat Single Sign On
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-21T16:37:38.031Z

Reserved: 2026-09-18T10:05:12.467Z

Link: CVE-2026-93569

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-18T15:17:20.743

Modified: 2026-09-21T17:19:17.983

Link: CVE-2026-93569

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-10T00:51:06Z

Links: CVE-2026-93569 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-19T22:29:28Z

Weaknesses