CVE-2026-93493 Red Hat CVE debrief

Who should care

Defenders responsible for applications using Netty's `netty-handler-ssl-ocsp` component should assess exposure and verify certificate validation. This includes operators, platform administrators, vulnerability management teams, and security teams who oversee the deployment and maintenance of applications that rely on Netty for SSL/TLS connections. Verifying certificate validation and monitoring for potential security control bypasses are crucial steps in  

Why it matters

A flaw in Netty's `netty-handler-ssl-ocsp` component can cause OCSP validation to be skipped, leading to applications proceeding with unvalidated certificates. Defenders should prioritize verifying certificate validation in applications using this component.

• Potential bypass of security controls where certificate validation is expected
• Verification of certificate validation in applications using Netty's `netty-handler-ssl-ocsp` component
• Monitoring for potential security control bypasses

Technical summary

A flaw in Netty's `netty-handler-ssl-ocsp` component can cause OCSP validation to be skipped, leading to applications proceeding with unvalidated certificates. The vulnerability is triggered by a remote attacker providing an Online Certificate Status Protocol (OCSP) response that omits the optional `nextUpdate` field. This causes the OCSP validation to be silently skipped, potentially leading to a bypass of security controls where certificate validation is expected. The affected component, `netty-handler-ssl-ocsp`, is used for handling SSL/TLS connections and certificate validation.

Defensive priority

Defenders should prioritize verifying certificate validation in applications using Netty's `netty-handler-ssl-ocsp` component.

Recommended defensive actions

• Verify certificate validation in applications using Netty's `netty-handler-ssl-ocsp` component
• Check for updates to Netty's `netty-handler-ssl-ocsp` component
• Monitor for potential security control bypasses
• Review compensating controls for exposed systems while remediation is scheduled and verified
• 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
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further verification is required to determine the affected versions and remediation. The lack of detailed information on affected versions and remediation steps makes it crucial for defenders to verify certificate validation in applications using Netty's `netty-handler-ssl-ocsp` component. The vulnerability's impact on security controls where certificate validation is expected should be carefully evaluated.

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.