What to know:
- The Zcash Zebra upgrade fixes flaws that could disrupt node operations and sync risks.
- A critical parser bug risked block validation disputes and possible chain disagreement.
- Release adds shielded mining rewards and fixes denial-of-service vulnerabilities.
The Zcash Foundation has told Zebra node operators to install version 4.5.0 immediately. Developers said the release fixes flaws that could disrupt operations or halt synchronization. The Zcash Zebra upgrade also addresses risks tied to valid blockchain data across nodes.
The release was announced after a broad security review of Zebra, Zcash’s node software, completed through outside research. The Zcash Zebra upgrade fixes consensus, networking, synchronization, wallet, and balance calculation issues found during that review. It also adds support for mining rewards sent directly to shielded addresses.
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Zcash Zebra Upgrade Fixes Parser Flaw
The most serious bug affected Zebra’s transparent script parser. This was about P2SH redeem scripts that had disabled opcodes. It made Zebra count signature operations less than the 20,000-sigop block limit during block validation checks, according to the foundation.
If there is an error, Zcash might provide blocks other Zcash implementations reject. This might lead to a disagreement among nodes regarding the validity of chain data. In an extreme case, the Zcash Zebra upgrade was necessary to minimize the risk of a chain split.
The foundation attributed credit to security researcher Samsulselfut for the discovery of the important parser problem. Several high or medium severity denial of service vulnerabilities have also been resolved. The vulnerabilities may result in node instability during validation, restart, synchronization, and peer interaction.
One fixed issue could cause node panics on consensus-valid blocks accepted by the network. Another was that of a balance overflow that could cause a node to halt after restart. The Zcash Zebra upgrade also solved the problem of abuse of the mempool queue by malicious peers.
Other fixes included sync restart poisoning, subtree corruption following forks, RPC panics, and memory leaks. It was reported that there were no effective workarounds for the vulnerabilities listed. It advised operators to upgrade rather than take temporary measures.
Zcash Upgrade Strengthens Privacy Features
The review has been conducted via the ZCG Vulnerability Disclosure Initiative. Over 80 reports were submitted to the program by researchers. Those reports helped the developers identify vulnerabilities in various components of Zebra, such as validation, networking, wallets, and balances.
The Zcash Zebra upgrade will allow miners to earn rewards with shielded addresses. This adjustment will decrease the public availability of the reward information for payment. It also improves the overall privacy model of Zcash without altering its optional design.
The privacy features are the only difference between Zcash and Bitcoin. Bitcoin records transactions on a transparent blockchain by default for public review. The shielded transactions, which are based on zk-SNARK, allow Zcash users to conceal the amount of the transactions and the addresses of their wallets.
The foundation is still used for network maintenance and development. It had $36.7 million of liquid assets at the end of the first quarter of 2026. This included approximately $21 million in ZEC and $12.6 million in cash and USDC.
Operating expenses for each quarter were approximately $817,000. The new release enhances Zebra’s security and robustness in both normal and rogue network conditions, the foundation said. The Zcash Zebra upgrade is still the best option for stable network participation for node operators.
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