PANews reported on May 2nd that the Zcash Foundation officially announced the release of Zebra version 4.4.0. This update fixes several critical consensus-level security vulnerabilities and strongly recommends that all node operators upgrade immediately. These vulnerabilities include a denial-of-service vulnerability that could cause new blocks to be permanently stopped being discovered, consensus disagreements caused by incorrect sigops counting in block signature operations, abnormal transparent transaction signature hash processing, and the risk of memory allocation amplification attacks.

The Zcash Foundation stated that some of the vulnerabilities could cause Zebra nodes to accept blocks rejected by zcashd, leading to chain forks. If not updated in time, nodes may face risks such as block discovery interruption, consensus forks, and amplified resource consumption, and there are currently no alternative mitigation solutions.