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6.5Medium

CVE-2026-93573Io.netty/netty-codec-http: netty split transfer-encoding fields bypass final-chunked validation and enable request smuggling

Red Hat Red Hat Build of Debezium 3.6; Red Hat Red Hat build of Keycloak 26.4; Red Hat Red Hat build of Keycloak 26.4.17; Red Hat Red Hat build of Keycloak 26.6 Published: (1 month ago)

Description

A flaw was found in Netty's HTTP/1.1 decoder. This vulnerability allows a remote attacker to bypass `Transfer-Encoding` header validation by splitting the `Transfer-Encoding` field across multiple headers, with the last field containing a non-final transfer coding like `gzip` or `deflate`. This bypass can lead to HTTP request smuggling, enabling attackers to bypass security controls, desynchronize request processing, or cause requests to be processed in an unintended context.

Weakness (CWE): CWE-444

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

VendorProductVersions
build keycloak 26.4 —
build keycloak 26.6 —
quarkus 3.27 —
quarkus 3.33 —
Red Hat Red Hat AMQ Broker 7 all versions
Red Hat Red Hat AMQ Clients all versions
Red Hat Red Hat build of Apache Camel 4 for Quarkus 3 all versions
Red Hat Red Hat build of Apache Camel for Spring Boot 4 all versions
Red Hat Red Hat build of Apicurio Registry 3 all versions
Red Hat Red Hat Build of Debezium 3.6 —
Red Hat Red Hat build of Keycloak 26.4 all versions
Red Hat Red Hat build of Keycloak 26.4.17 —
Red Hat Red Hat build of Keycloak 26.6 all versions
Red Hat Red Hat build of Keycloak 26.6.8 —
Red Hat Red Hat build of Quarkus 3.27.5.SP2 —
Red Hat Red Hat build of Quarkus 3.33.3.SP2 —
Red Hat Red Hat Data Grid 8 all versions
Red Hat Red Hat Fuse 7 —
Red Hat Red Hat JBoss Enterprise Application Platform 7 —
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 —
Red Hat Red Hat Single Sign-On 7 —

References and patches