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High severity7.4OSV Advisory· Published Jul 21, 2026· Updated Jul 30, 2026

CVE-2026-56820

CVE-2026-56820

Description

Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and prior to 4.1.135.Final, OcspClient does not validate that the CertificateID in an OCSP response matches the requested CertificateID, which can lead to replay attack. OcspClient.validateResponse accepts a legitimately signed GOOD status response for an unrelated certificate issued by the same CA, allowing bypass of revocation checks for another certificate. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-handler-ssl-ocspMaven
>= 4.2.0.Final, < 4.2.16.Final4.2.16.Final
io.netty:netty-handler-ssl-ocspMaven
< 4.1.136.Final4.1.136.Final

Affected products

21

Patches

Vulnerability mechanics

References

7

News mentions

1