CVE-2026-93567Io.netty/netty-codec-http2: http/1 authority-form connect is translated to malformed http/2 connect with host-controlled :authority

Description

A flaw was found in Netty's HTTP/2 codec. When converting HTTP/1 CONNECT requests to HTTP/2, the component incorrectly uses the Host header instead of the CONNECT authority-form request-target for the tunnel authority. A remote attacker can exploit this by supplying a different Host header, leading to a malformed HTTP/2 CONNECT request. This can bypass security controls such as tunnel allow-lists or egress policies, resulting in integrity loss.

Timeline

Scores

EPSS (exploitation in 30 days)

2.9% · top 13% of all CVEs (15 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Affected products

• Red Hat · Red Hat Build of Apache Camel 3.33.3.SP2

  • unaffected 4.1.138.Final-redhat-00001 – < *

• Red Hat · Red Hat Build of Debezium 3.6

  All versions: unaffected

• Red Hat · Red Hat build of Keycloak 26.4

  • unaffected 26.4.17-2 – < *

• Red Hat · Red Hat build of Keycloak 26.4

  • unaffected 26.4-29 – < *

• Red Hat · Red Hat build of Keycloak 26.4

  • unaffected 26.4-30 – < *

• Red Hat · Red Hat build of Keycloak 26.4.17

  All versions: unaffected

• Red Hat · Red Hat build of Keycloak 26.6

  • unaffected 26.6.8-2 – < *

• Red Hat · Red Hat build of Keycloak 26.6

  • unaffected 26.6-24 – < *

• Red Hat · Red Hat build of Keycloak 26.6

  • unaffected 26.6-24 – < *

• Red Hat · Red Hat build of Keycloak 26.6.8

  All versions: unaffected

• Red Hat · Red Hat build of Quarkus 3.27.5.SP2

  All versions: unaffected

• Red Hat · Red Hat build of Quarkus 3.33.3.SP2

  All versions: unaffected

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1

  All versions: unaffected

• Red Hat · Red Hat AMQ Broker 7

  All versions: unaffected

• Red Hat · Red Hat build of Apache Camel 4 for Quarkus 3

  All versions: affected

• Red Hat · Red Hat build of Apache Camel for Spring Boot 4

  All versions: affected

• Red Hat · Red Hat build of Apicurio Registry 3

  All versions: affected

• Red Hat · Red Hat Data Grid 8

  All versions: affected

• Red Hat · Red Hat Fuse 7

  All versions: affected

• Red Hat · Red Hat JBoss Enterprise Application Platform 7

  All versions: affected

• Red Hat · Red Hat JBoss Enterprise Application Platform 8

  All versions: unaffected

• Red Hat · Red Hat JBoss Enterprise Application Platform Expansion Pack

  All versions: affected

• Red Hat · Red Hat Single Sign-On 7

  All versions: affected

What to do

Workaround: See https://github.com/netty/netty/security/advisories/GHSA-45h4-vhwh-fmhg for fixed versions and remediation guidance.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-82943 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-93567](https://cveledger.app/badge/CVE-2026-93567.svg)](https://cveledger.app/cve/CVE-2026-93567)

Record last updated 6 Nov 2026, 17:12 UTC.