CVE-2026-56821 – Netty: Out-of-date OCSP Responses Accepted by OcspServerCertificateValidator

CVE ID :CVE-2026-56821

Published : July 29, 2026, 12:16 a.m. | 23 minutes ago

Description :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 Prior to versions 4.1.136.Final and 4.2.16.Final, the OcspServerCertificateValidator flags an out-of-date OCSP response but does not stop processing it, so an expired GOOD response is still reported as VALID, letting an on-path attacker replay a stale GOOD response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. Exploitation can lead to certificate revocation bypass via replay of an expired OCSP response. Any application using OcspServerCertificateValidator is affected; a revoked certificate can be accepted. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.

Severity: 7.4 | HIGH

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