CVE-2026-52739 ZEBRA: Repeated Non-Finalized Shielded Transaction Aborts Zebra Before Duplicate-Nullifier Rejection

ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, a malicious block producer can terminate zebrad by placing the same shielded transaction in a non-finalized parent block and its child. In zebra-state/src/service/nonfinalizedstate/chain.rs, Chain::push originally inserted the...

CVE-2026-52739

Affected: zebrad up to v4.4.1. Root cause: Chain::push in zebra-state/src/service/non_finalized_state/chain.rs:1608-1628 inserts the transaction hash into tx_loc_by_hash with an assert_eq! before running the duplicate shielded-nullifier guard, so a repeated shielded transaction in a child block t...

CVE-2026-52739 ZEBRA: Repeated Non-Finalized Shielded Transaction Aborts Zebra Before Duplicate-Nullifier Rejection

ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, a malicious block producer can terminate zebrad by placing the same shielded transaction in a non-finalized parent block and its child. In zebra-state/src/service/nonfinalizedstate/chain.rs, Chain::push originally inserted the...

EUVD-2025-22951

Malicious code in bioql PyPI...

CVE-2025-54427

CVE-2025-54427 (Polkadot Frontier) : The vulnerability affects Polkadot Frontier’s note_min_gas_price_target intrinsic. Before commit a754b3d, the check_inherent function was not implemented, allowing the block producer to set the target gas price without verification. This input drives MinGasPri...

Transaction Fee Mechanism Design for Leaderless Blockchain Protocols

We initiate the study of transaction fee mechanism design for blockchain protocols in which multiple block producers contribute to the production of each block. Our contributions include: - We propose an extensive-form multi-stage game model to reason about the game theory of multi-proposer...