Zcash Faces 30% Drop Following Discovery of Major Security Flaw
Zcash plummets 30% as Shielded Labs reveals a major bug that went undetected for four years

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Zcash (ZEC) experienced a significant 30% decline to $400 after Shielded Labs disclosed a critical vulnerability in its Orchard privacy pool. The bug, which could have allowed unlimited counterfeit tokens, was undetected for four years and was patched within days of its discovery on May 29, 2026.
- 01The vulnerability in Zcash's Orchard privacy pool could have enabled attackers to create unlimited counterfeit ZEC tokens without detection.
- 02Discovered by Taylor Hornby using AI tools, the bug was present since Orchard's activation in May 2022.
- 03Shielded Labs coordinated an emergency fix on June 1, 2026, but cannot confirm if the bug was exploited prior to the patch.
- 04The organization is proposing a network upgrade to enhance security and restore trust in ZEC's supply integrity.
- 05Shielded Labs is accelerating security measures, including hiring new experts and conducting formal verification projects.
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Zcash (ZEC) saw a drastic 30% drop in value, falling to $400, after Shielded Labs revealed a serious vulnerability in its Orchard privacy pool. This bug, which had been undetected for four years, could have allowed attackers to create unlimited counterfeit tokens without detection. The flaw was discovered on May 29, 2026, by security engineer Taylor Hornby, who utilized Anthropic’s Opus 4.8 AI model to identify the issue. An emergency fix was implemented by June 1, but Shielded Labs admitted that it cannot definitively determine if the bug was exploited before the patch was applied. The organization is now proposing a network upgrade that includes new accounting measures to restore confidence in ZEC's supply. Additionally, Shielded Labs is ramping up its security efforts, including hiring a Head of Security and a Cryptographer, and plans to publish a detailed post on the proposed upgrade soon. The situation has raised concerns in the market, reflecting the challenges of maintaining trust in privacy-focused cryptocurrencies.
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The decline in Zcash's value could affect investors and users who rely on the cryptocurrency for transactions and investments.
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