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CVE-2026-93567

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

Published: Sep 18, 2026Updated: Sep 22, 2026 Sources: CVE List NVDCWE-20
7.5HIGH
NVD MITRE
EPSS Score
0.6%
Top 54.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-20

Affected Products

Red Hat
commercial·US
Red Hat AMQ Broker 7On-prem
Operating Systems / linux-distro
Red Hat build of Apache Camel 4 for Quarkus 3LibraryLibrary
OSS Libraries / generic-library
Red Hat build of Apache Camel for Spring Boot 4LibraryLibrary
OSS Libraries / generic-library
Red Hat build of Apicurio Registry 3On-prem
DevTools & CI
Red Hat build of Debezium 3On-premLibrary
OSS Libraries / generic-library
Red Hat Build of Keycloak
Web & CMS Plugins
Red Hat Data Grid 8On-premDatabase
Databases / cache-message-queue
Red Hat Fuse 7On-premDev Tool
DevTools & CI / ci-cd
and 3 more affected products View all →

Exploitability

Workaround Available
Is your org exposed to CVE-2026-93567?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://access.redhat.com/errata/RHSA-2026:69440
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:69470
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:70257
access.redhat.com
and 2 more references View all →

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