CVE-2026-52739

The record

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/non_finalized_state/chain.rs, Chain::push originally inserted the transaction hash into tx_loc_by_hash and asserted uniqueness before updating shielded data and running the duplicate Sprout, Sapling, or Orchard nullifier checks. The repeated transaction therefore reached the transactions must be unique within a single chain assertion before contextual validation could reject it cleanly. Zebra release builds use panic equals abort, so the reachable assertion terminates the entire process; exploitation requires either two consecutive attacker-mined blocks or an attacker-mined child immediately after an honest block includes the attacker's shielded transaction. This issue is fixed in version 4.5.0.

Affected packages

Related vulnerabilities

• CVE-2026-100347 kin-openapi is a Go project for handling OpenAPI files. CWE-248
• CVE-2026-102599 Socket.IO enables bidirectional and low-latency communication for every platform. CWE-248
• CVE-2026-107382 MariaDB Connector/Node.js is used to connect applications developed on Node.js to MariaDB… CWE-248
• CVE-2026-106122 The RabbitMQ Java client library allows Java and JVM-based applications to connect to and… CWE-248
• CVE-2026-105757 vLLM is an inference and serving engine for large language models. CWE-248
• CVE-2026-105756 vLLM is an inference and serving engine for large language models. CWE-248
• CVE-2026-103387 A weakness has been identified in garycourt uri-js up to 4.4.1. CWE-248
• CVE-2026-102281 Nest is a framework for building scalable Node.js server-side applications. CWE-248