CVE-2026-93567 Red Hat CVE debrief

Who should care

Defenders responsible for Red Hat Build of Apache Camel 3.33.3.SP2 and other affected products should assess exposure and prioritize patching or mitigation. This includes operators, platform administrators, vulnerability management teams, and security teams. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Defenders should also plan vendor-supported updates or mitigations through a 3

Why it matters

CVE-2026-93567 is a HIGH-severity vulnerability in Netty's HTTP/2 codec that can allow remote attackers to bypass security controls. Defenders should prioritize verifying exposure and applying patches or mitigations.

• Potential bypass of security controls such as tunnel allow-lists or egress policies
• Integrity loss due to malformed HTTP/2 CONNECT requests

Technical summary

The Netty HTTP/2 codec incorrectly uses the Host header instead of the CONNECT authority-form request-target for the tunnel authority, allowing a remote attacker to supply a different Host header and create a malformed HTTP/2 CONNECT request. This can occur when converting HTTP/1 CONNECT requests to HTTP/2. The incorrect usage of the Host header can lead to a malformed HTTP/2 CONNECT request, potentially bypassing security controls. The vulnerability has a CVSS score of 7.5 and is considered HIGH severity. A remote attacker can exploit this by supplying a different Host header.

Defensive priority

Defenders should prioritize verifying exposure in Red Hat Build of Apache Camel 3.33.3.SP2 and other affected products, and apply patches or mitigations as available.

Recommended defensive actions

• Verify exposure in Red Hat Build of Apache Camel 3.33.3.SP2 and other affected products
• Apply patches or mitigations as available
• Monitor for potential bypass attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE Program record and NVD vulnerability detail provide official information about the vulnerability. Red Hat has released several advisories related to this CVE, including RHSA-2026:69440, RHSA-2026:69470, and RHSA-2026:70257.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.