The Zcash Foundation has released Zebra 4.4.0, addressing critical security vulnerabilities in its consensus protocol. The update resolves a denial-of-service vulnerability that could halt block discovery, corrects sigops count issues affecting transaction validation, and fixes a transparent sighash consensus discrepancy. Additionally, it mitigates a memory allocation risk in network deserialization. Node operators are strongly advised to upgrade immediately to ensure network security and stability. The release also includes resource limits on the indexer gRPC server and RPC request body sizes, and updates the librustzcash dependency to address a security risk.