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Highest advisory severityMedium 1 vendor · 1 advisory

CVE-2026-56821

CVE-2026-56821: 1 tracked advisory record across Red Hat. Compare source-reported impact, fixes and remediation.

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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Vendor advisory comparison

Red Hat

1 advisory
  • Advisory severityMedium5.7

    Medium [CVE-2026-56821] Improper certificate revocation check in netty-handler-ssl-ocsp

    CVE-2026-56821Source published Source updated

    Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, the OcspServerCertificateValidator flags an out-of-date OCSP response but does not stop processing it, so an expired GOOD response is still reported as VALID, letting an on-path attacker replay a stale GOOD response to bypass revocation of a since-revoked certificate. Any application using OcspServerCertificateValidator is affected; a revoked certificate can be accepted. A flaw was found in netty-handler-ssl-ocsp, a component of the Netty network application framework. The Online Certificate Status Protocol (OCSP) stapling validator in this component does not properly check certificate revocation status. This can allow an attacker to use revoked certificates without…

    Affected products in this advisory
    • Red Hat build of Apache Camel for Spring Boot 4
    • Red Hat Data Grid 8
    • Red Hat JBoss Enterprise Application Platform Expansion Pack
    Source-reported affected versions
    • < 4.1.136.Final
    • < 4.2.16.Final
    Source-reported fixed versions
    • 4.1.136
    • 4.2.16
    Mitigation guidance
    • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
    Full advisory and evidenceOpen source bulletin

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