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ZcashFoundation

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low advisory

Denial of Service in ZcashFoundation Zebra Node

A vulnerability in ZcashFoundation Zebra 6.4.0 and 6.4.1 allows unauthenticated remote attackers to crash the node by sending a crafted version 6 transaction with a pre-NU6.3 consensus branch ID.

Zebra
1t 1c
critical advisory

Zebra Consensus Divergence in Transparent Sighash Hash-Type Handling (CVE-2026-44497)

Zebra versions prior to 4.4.0 exhibit a consensus divergence vulnerability (CVE-2026-44497) due to insufficient error handling of invalid sighash types during sighash computation, potentially leading to network partitioning and double-spend attacks.

zebrad +1 consensus-failure vulnerability network-partition
2r
medium advisory

Zebra Block Validator Sigops Undercount Vulnerability

Zebra's block validator undercounts signature operations, allowing it to accept invalid blocks, leading to a network split between Zebra and zcashd nodes.

zebra blockchain consensus-failure zcash
2r