Zcash Foundation released Zebra 4.4.0 to fix multiple consensus-critical security vulnerabilities in its node software and urged all node operators to upgrade immediately. According to the official announcement, the flaws could expose the network to denial-of-service risks, consensus splits, and potential chain forks, and the Foundation said there is no alternative mitigation available. Because consensus-critical issues can cause nodes to disagree on blockchain state, the update is positioned as an urgent measure to protect network reliability and prevent wider operational disruption.