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Vulnerabilities CVE-2026-56821

CVE-2026-56821

High
Open
TLP:CLEAR

Netty: Out-of-date OCSP Responses Accepted by OcspServerCertificateValidator

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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 Prior to versions 4.1.136.Final and 4.2.16.Final, the OcspServerCertificateValidator flags an out-of-date OCSP response but does not stop processing it, so an expired GOOD response is still reported as VALID, letting an on-path attacker replay a stale GOOD response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.

Details

CVSS Score
7.4
EPSS Score
0.14%

3.6th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Confidence
90%
Published
Jul 28, 2026
Last Modified
Jul 28, 2026
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