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Vulnerability · Published Sep 18, 2026 · Assigned by redhat

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

Medium 6.5

In plain English

A medium-severity security flaw in Red Hat AMQ Broker 7 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.9%top 40.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12nettyno fix listedDEBIAN-CVE-2026-93573
Debian:13nettyno fix listedDEBIAN-CVE-2026-93573
Debian:14nettyno fix listedDEBIAN-CVE-2026-93573
Ubuntu:26.10nettyno fix listedUBUNTU-CVE-2026-93573

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Build of Debezium 3.6 see references
Red Hat Red Hat build of Quarkus 3.27.5.SP2 see references
Red Hat Red Hat build of Quarkus 3.33.3.SP2 see references
Red Hat Red Hat AMQ Broker 7 see references
Red Hat Red Hat AMQ Clients see references
Red Hat Red Hat build of Apache Camel 4 for Quarkus 3 see references
Red Hat Red Hat build of Apache Camel for Spring Boot 4 see references
Red Hat Red Hat build of Apicurio Registry 3 see references
Red Hat Red Hat Build of Keycloak see references
Red Hat Red Hat Data Grid 8 see references
Red Hat Red Hat Fuse 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8 see references
Red Hat Red Hat Single Sign-On 7 see references

Weakness: CWE-444 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References