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Vulnerability · Published Sep 18, 2026 · Assigned by redhat

CVE-2026-93566Io.netty/netty-codec-http: netty: http request smuggling due to control characters in the chunk-size line

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 0.5% (higher than 42% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.5%top 58.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in Netty. A remote attacker could exploit this by sending a specially crafted HTTP request that includes control characters within the chunk-size line. This bypasses the intended strict validation, allowing the attacker to inject arbitrary HTTP requests. This vulnerability can lead to HTTP request smuggling, potentially resulting in information disclosure or other unauthorized actions.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12nettyno fix listedDEBIAN-CVE-2026-93566
Debian:13nettyno fix listedDEBIAN-CVE-2026-93566
Debian:14nettyno fix listedDEBIAN-CVE-2026-93566
Ubuntu:26.10nettyno fix listedUBUNTU-CVE-2026-93566

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-1035 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References