CVE-2026-93579 Red Hat CVE debrief

Who should care

Defenders responsible for Red Hat build of Quarkus, Red Hat AMQ Broker, and other affected products should assess exposure and prioritize remediation based on official vendor advisories. This includes roles responsible for vulnerability management, security teams, and operators of affected platforms. Defenders should also review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

Defenders should care about CVE-2026-93579 because it allows remote attackers to inject prohibited characters into HTTP/2 header field values, potentially leading to security bypasses and unauthorized access. Affected roles include those responsible for Red Hat build of Quarkus, Red Hat AMQ Broker, and other affected products. The vulnerability supports consequences such as request smuggling, header injection, or response splitting. Defenders should prioritize verifying affected versions and applying vendor remediation.

• Potential security bypasses due to insufficient validation of HTTP/2 header field values.
• Possible request smuggling, header injection, or response splitting.
• Need for verification of affected versions and application of vendor remediation.
• Potential for unauthorized access or data manipulation.

Technical summary

The vulnerability allows a remote attacker to inject prohibited characters, such as NUL, Line Feed, and Carriage Return, into HTTP/2 header field values due to insufficient validation in Netty's HTTP/2 stack. This can lead to request smuggling, header injection, or response splitting when these values cross an HTTP/2 to HTTP/1.1 translation boundary. The vulnerability affects products such as Red Hat build of Quarkus and Red Hat AMQ Broker, and defenders should prioritize verifying affected versions and applying vendor remediation.

Defensive priority

Defenders should prioritize verifying affected versions and applying vendor remediation to prevent potential security bypasses.

Recommended defensive actions

• Verify affected versions of Red Hat build of Quarkus, Red Hat AMQ Broker, and other affected products.
• Apply vendor remediation from Red Hat advisories RHSA-2026:69440 and RHSA-2026:69470.
• Monitor for potential security bypasses and unauthorized access.
• Update inventory checks to account for this vulnerability.
• 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.

Evidence notes

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

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.