CVE-2026-93569 PUBLISHED

Io.netty/netty-codec-http2: http/1 absolute-form host mismatch is translated to http/2 :authority, overriding the request-target authority

Assigner: redhat
Reserved: 18.09.2026 Published: 18.09.2026 Updated: 18.09.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
CVSS Score: 8.2

Product Status

Vendor Red Hat
Product Red Hat AMQ Broker 7
Versions Default: unaffected
Vendor Red Hat
Product Red Hat build of Apache Camel 4 for Quarkus 3
Versions Default: affected
Vendor Red Hat
Product Red Hat build of Apache Camel for Spring Boot 4
Versions Default: affected
Vendor Red Hat
Product Red Hat build of Apicurio Registry 3
Versions Default: affected
Vendor Red Hat
Product Red Hat build of Debezium 3
Versions Default: affected
Vendor Red Hat
Product Red Hat Build of Keycloak
Versions Default: affected
Vendor Red Hat
Product Red Hat build of Quarkus
Versions Default: affected
Vendor Red Hat
Product Red Hat Data Grid 8
Versions Default: affected
Vendor Red Hat
Product Red Hat Fuse 7
Versions Default: affected
Vendor Red Hat
Product Red Hat JBoss Enterprise Application Platform 7
Versions Default: affected
Vendor Red Hat
Product Red Hat JBoss Enterprise Application Platform 8
Versions Default: affected
Vendor Red Hat
Product Red Hat Single Sign-On 7
Versions Default: affected

Workarounds

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

References

Problem Types

  • Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') CWE