AIKIDO-2026-263738
netty-handler-ssl-ocsp is vulnerable to Improper Certificate Validation
74
High Risk
This Affects:
netty-handler-ssl-ocspTL;DR
Netty's OcspClient verifies OCSP response signatures but never checks that the response's CertificateID matches the certificate under validation. An attacker who can intercept or proxy OCSP traffic can replay a legitimately signed GOOD response that was issued for any other non-revoked certificate from the same CA, and the client will accept it for a revoked or unrelated target certificate. This breaks RFC 6960 revocation checking and allows certificate validation bypass.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application uses Netty's OcspClient to check certificate revocation status over OCSP.
Background info
netty-handler-ssl-ocsp is vulnerable to Improper Certificate Validation in versions 4.1.86.Final - 4.1.135.Final and 4.2.0.Final - 4.2.15.Final.
How to fix this
Upgrade the io.netty:netty-handler-ssl-ocsp library to the patch version.
Links
GitHub Releases
Fix Commits
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