CVE-2026-93569
Io.netty/netty-codec-http2: http/1 absolute-form host mismatch is translated to http/2 :authority, overriding the request-target authority
- State
- Published
- Severity
- 8.2 High
- Published
- Sep 18, 2026
- Updated
- Oct 19, 2026
- Reserved
- Sep 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.2 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N | redhat |
Weaknesses
- CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Affected Products
| Product | Versions |
|---|---|
Red Hat Build of Apache Camel 3.33.3.SP2Red Hat |
|
Red Hat Build of Debezium 3.6Red Hat | |
Red Hat build of Quarkus 3.27.5.SP2Red Hat | |
Red Hat build of Quarkus 3.33.3.SP2Red Hat | |
Red Hat AMQ Broker 7Red Hat | |
Red Hat build of Apache Camel 4 for Quarkus 3Red Hat | |
Red Hat build of Apache Camel for Spring Boot 4Red Hat | |
Red Hat build of Apicurio Registry 3Red Hat | |
Red Hat Build of KeycloakRed Hat | |
Red Hat Data Grid 8Red Hat | |
Red Hat Fuse 7Red Hat | |
Red Hat JBoss Enterprise Application Platform 7Red Hat | |
Red Hat JBoss Enterprise Application Platform 8Red Hat | |
Red Hat JBoss Enterprise Application Platform Expansion PackRed Hat | |
Red Hat Single Sign-On 7Red Hat |
References
- RHSA-2026:69440vendor-advisory
- RHSA-2026:69470vendor-advisory
- RHSA-2026:70257vendor-advisory
- RHSA-2026:83612vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-93569vdb-entry
- RHBZ#2536962issue-tracking
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