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CVE-2026-56820

Netty: Missing CertificateID Validation in OCSP Response Allows Replay Attacks PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
netty / nettyaffected >= 4.2.0.Final, < 4.2.16.Final; affected < 4.1.136.Final

CWE

CWE-295

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.