Zcash has fallen 45% since early 1 Jun after an emergency hard fork was deployed to fix a critical vulnerability in its Orchard shielded transaction system, drawing sharp criticism over management and privacy concerns.
Zcash Falls 45% as Emergency Protocol Fix Triggers Governance Criticism
5 June 2026 - 10:54 CEST
By Matt Neill
The token had experienced a strong rally in May following its Robinhood listing and renewed institutional interest in privacy coins. At 09:00UTC, ZEC was trading at around $307 with a market capitalization of approximately $5.2bn. Zcash’s 24-hour trading volume remained elevated, according to CoinMarketCap data.
The bug and the fix
Independent security researcher Taylor Hornby discovered a critical soundness vulnerability in the Orchard shielded transaction system on 29 May during an audit conducted for Shielded Labs. Orchard is Zcash’s most advanced privacy technology, which uses zero-knowledge proofs to hide transaction details.
The flaw could have allowed invalid state transitions – essentially invalid changes to the record of shielded balances – within the Orchard pool, potentially permitting double-spending of funds. However, it could not inflate the total ZEC supply due to Zcash’s turnstile mechanism, which tracks the total balance across all value pools. There is no evidence of exploitation, the Zcash Foundation said in a statement.
Zcash engineers responded within hours. An emergency soft fork in Zebra 4.5.3 (the main node software) temporarily disabled all Orchard actions. On 3 Jun, a hard fork activated, re-enabling shielded transactions with the corrected circuit.
The Zcash Foundation said all user privacy was unaffected throughout and that Sapling and transparent transactions continued operating normally. Node operators are being urged to upgrade to the latest version of Zebra immediately.
Volatility after strong run
The sharp reversal comes after a strong rally in May. The token benefited from its Robinhood listing and a broad re-rating of privacy assets. Grayscale’s filing to convert its Zcash Trust into a spot ETF added further momentum to the price.
The emergency protocol incident now poses a test of whether that institutional interest survives scrutiny of the network’s governance and security disclosure practices.
The response has drawn criticism from within the ecosystem over the concentration of coordination power in a small set of entities. Prominent community member Seth For Privacy (@sethforprivacy) and several wallet providers said they learned of the incident only from a public post, received meaningful information only hours before the hard fork activated, and were forced into last-minute updates.
