[Zcash Foundation Releases Zebra Update to Fix Critical Vulnerability] According to the Zcash Foundation, the organization has released Zebra 4.5.3 and 5.0.0 to address a critical vulnerability in the Orchard zero-knowledge proof circuit. Version 4.5.3 temporarily disables Orchard operations, while version 5.0.0 activates NU 6.2 and permanently resolves the issue. The official statement indicates there is no evidence that the vulnerability has been exploited, no unauthorized issuance of ZEC has occurred, and user privacy remains unaffected. Node operators are urged to upgrade to Zebra 5.0.0 as soon as possible.