# Io.netty/netty-codec-http: netty: http request smuggling due to control characters in the chunk-size line CVE record · `CVE-2026-93566` - **Identifiers:** `CVE-2026-93566` - **State:** Confirmed - **Severity:** CVSS 6.5 Medium - **Critical:** No - **CNA:** redhat - **Weakness (CWE):** [CWE-1035](https://cwe.mitre.org/data/definitions/1035.html) - **Tags:** [CWE-1035](https://agentprime.io/advisories/tag/cwe-1035.md) - **Technologies:** [Red Hat Build of Debezium 3.6](https://agentprime.io/advisories/technology/red-hat-build-of-debezium-3-6.md) · [Red Hat build of Quarkus 3.27.5.SP2](https://agentprime.io/advisories/technology/red-hat-build-of-quarkus-3-27-5-sp2.md) · [Red Hat build of Quarkus 3.33.3.SP2](https://agentprime.io/advisories/technology/red-hat-build-of-quarkus-3-33-3-sp2.md) · [Red Hat AMQ Broker 7](https://agentprime.io/advisories/technology/red-hat-amq-broker-7.md) · [Red Hat AMQ Clients](https://agentprime.io/advisories/technology/red-hat-amq-clients.md) · [Red Hat build of Apache Camel 4 for Quarkus 3](https://agentprime.io/advisories/technology/red-hat-build-of-apache-camel-4-for-quarkus-3.md) · [Red Hat build of Apache Camel for Spring Boot 4](https://agentprime.io/advisories/technology/red-hat-build-of-apache-camel-for-spring-boot-4.md) · [Red Hat build of Apicurio Registry 3](https://agentprime.io/advisories/technology/red-hat-build-of-apicurio-registry-3.md) · [Red Hat Build of Keycloak](https://agentprime.io/advisories/technology/red-hat-build-of-keycloak.md) · [Red Hat Data Grid 8](https://agentprime.io/advisories/technology/red-hat-data-grid-8.md) · [Red Hat Fuse 7](https://agentprime.io/advisories/technology/red-hat-fuse-7.md) · [Red Hat JBoss Enterprise Application Platform 7](https://agentprime.io/advisories/technology/red-hat-jboss-enterprise-application-platform-7.md) · [Red Hat JBoss Enterprise Application Platform 8](https://agentprime.io/advisories/technology/red-hat-jboss-enterprise-application-platform-8.md) · [Red Hat Single Sign-On 7](https://agentprime.io/advisories/technology/red-hat-single-sign-on-7.md) - **Published:** 18 Sept 2026 - **Updated:** 15 Oct 2026 - **Reviewed by a person:** No Published by the CVE Program (CNA: redhat) at 18 Sept 2026, 14:19 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. ## Affected products, as the CNA wrote them - Vendor: Red Hat. Product: Red Hat Build of Debezium 3.6. - No versions given - Other versions: unaffected - Package name: `netty-codec-http` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat build of Quarkus 3.27.5.SP2. - No versions given - Other versions: unaffected - Package name: `netty-codec-http` - Collection: `https://access.redhat.com/jbossnetwork/restricted/listSoftware.html` - Vendor: Red Hat. Product: Red Hat build of Quarkus 3.33.3.SP2. - No versions given - Other versions: unaffected - Package name: `netty-codec-http` - Collection: `https://access.redhat.com/jbossnetwork/restricted/listSoftware.html` - Vendor: Red Hat. Product: Red Hat AMQ Broker 7. - No versions given - Other versions: affected - Package name: `netty-codec-http` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat AMQ Clients. - No versions given - Other versions: affected - Package name: `netty-codec-http` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat build of Apache Camel 4 for Quarkus 3. - No versions given - Other versions: affected - Package name: `netty-codec-http` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat build of Apache Camel for Spring Boot 4. - No versions given - Other versions: affected - Package name: `netty-codec-http` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat build of Apicurio Registry 3. - No versions given - Other versions: affected - Package name: `netty-codec-http` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat Build of Keycloak. - No versions given - Other versions: affected - Package name: `netty-codec-http` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat Data Grid 8. - No versions given - Other versions: affected - Package name: `netty-codec-http` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat Fuse 7. - No versions given - Other versions: unknown - Package name: `netty-codec-http` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 7. - No versions given - Other versions: unknown - Package name: `netty-codec-http` - Collection: `https://access.redhat.com/jbossnetwork/restricted/listSoftware.html` - Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8. - No versions given - Other versions: affected - Package name: `netty-codec-http` - Collection: `https://access.redhat.com/jbossnetwork/restricted/listSoftware.html` - Vendor: Red Hat. Product: Red Hat Single Sign-On 7. - No versions given - Other versions: unknown - Package name: `netty-codec-http` - Collection: `https://access.redhat.com/downloads/content/package-browser/` ## Not analysed yet We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter. ## Severity and exploitation - 6.5 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`, from CNA (redhat) - **CISA KEV:** Not listed. - **EPSS:** 0.0048, the 41st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline This record came from the full history of the CVE Program, published 18 Sept 2026. New records show when each source confirmed them. ## Sources - [CVE List: CVE-2026-93566](https://www.cve.org/CVERecord?id=CVE-2026-93566) - [NVD: CVE-2026-93566](https://nvd.nist.gov/vuln/detail/CVE-2026-93566) ### References from the CNA - (vendor-advisory, redhat) - (vendor-advisory, redhat) - (vendor-advisory, redhat) - (vdb-entry, redhat) - (issue-tracking, redhat) Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description. ## Check whether this affects you This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run. - With the agentprime MCP server (), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: - As JSON: - Everything that needs attention now: --- The web page: . Everything for agents: .