Zcash: ZEC Crash after Infinite Mint Exploit

Zcash dropped by around 30% following the announcement that Shielded Labs had uncovered a critical vulnerability in the Orchard shielded pool

Written by: Olumide Adesina • Monday, June 8, 2026 • 2 min read

• Last updated: Monday, June 8, 2026

Quick overview

Zcash's value plummeted by approximately 30% after a critical vulnerability was discovered in the Orchard shielded pool, allowing potential infinite minting of fake ZEC.
The vulnerability, identified by security engineer Taylor Hornby, had been active since May 2022 and was linked to an under-constrained element in the cryptographic circuit.
An emergency patch was released shortly after the discovery, but the implications of the flaw led to significant market reactions and forced liquidations across major exchanges.
BitMEX co-founder Arthur Hayes publicly sold his entire ZEC position, citing concerns over the coin's inability to guarantee past exploitations could not have occurred.

Zcash dropped by around 30% following the announcement that Shielded Labs had uncovered a critical vulnerability in the Orchard shielded pool that would have allowed an attacker to infinitely mint fake (ZEC) with the most advanced stealth ever to be performed on the blockchain.

Discovered by security engineer Taylor Hornby on May 29th, the bug was found in the cryptographic circuit that protected the highest-level privacy-centric transactions on the network.

Though the Zcash Open Development Lab managed to craft and release an emergency patch in a matter of days, markets reacted to the implications of the bug; namely, that the flaw had been active since the activation of Orchard back in May 2022, leaving the (ZEC) protocol compromised for nearly 4 years before detection.

Breakdowns of the bug revealed that it was caused by an under-constrained element in the Orchard circuit, an ability for false inputs to be arbitrarily submitted into the elliptic curve multiplication check. This essentially provided duping the math, meant to confirm shielded transactions, into approving the manipulated entries.

Hornby was able to create an exploit that successfully minted an infinite supply of stealth ZEC on his own regtest environment and claimed it would have worked equally well on mainnet using a wallet on that network. An emergency hard fork was activated on June 3, fixing the bug but causing immediate repricing on spot exchanges.

BitMEX co-founder Arthur Hayes also admitted that he dumped his entire ZEC position following the news, stating, “I just cannot hold a privacy coin that can’t be cryptographically proven that past exploitation could never have happened.”

This was just one part of a broader rebalancing strategy, with Hayes dumping Hyperliquid and Near Protocol, and announcing the death of what he calls the “Holy Trinity” of recent narrative bets. The high-profile capitulation added more fuel to already rapidly cascading selling in the derivatives market, with forced liquidations pushing down prices extremely rapidly on all of the major exchanges in early Asian trading.

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ABOUT THE AUTHOR See More

Olumide Adesina

Financial Market Writer

Olumide Adesina is a French-born Nigerian financial writer. He tracks the financial markets with over 15 years of working experience in investment trading.