By Isaac • June 6, 2026 10:33 am •
Zcash plunged on June 5, 2026 after Shielded Labs disclosed a critical bug in the Orchard privacy pool. The flaw could have allowed unlimited, undetectable counterfeit ZEC tokens if anyone had found and exploited it.
According to CoinDesk, the vulnerability had been sitting in the protocol since Orchard activated in May 2022. That is roughly four years of exposure inside the part of Zcash that is supposed to guarantee supply integrity.
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The discovery itself is part of the story. Security engineer Taylor Hornby found the bug on May 29, 2026 during a targeted review while using Anthropic’s Opus 4.8 model.
Developers shipped an emergency fix by June 1. The patch was fast, but it did not
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