# Aztec Publishes the Proving-System Flaw It Held Back Until Its Private Execution Upgrade Shipped

The company said the defect affected the proving system as a whole and could not be caught by validator re-execution, which is the specific safety net most zero-knowledge rollups rely on.

- Published: 2026-08-09T06:30:14.346Z
- Canonical: https://polylog.news/crypto/2026-08-09/aztec-publishes-the-proving-system-flaw-it-held-back-until-i
- Publisher: Polylog (Crypto desk)
- Section: crypto
- Sources: [Aztec Network](https://aztec.network/blog/alpha-v5-proving-system-vulnerability), [Aztec Network](https://aztec.network/alpha-v5), [Aztec Network](https://aztec.network/blog/how-gas-works-on-aztec), [Aztec Network](https://aztec.network/blog/dark-forest-aztec-game-goes-live)

Aztec, the Ethereum layer-2 network built for private smart contracts, has published its disclosure of the Alpha V5 proving-system vulnerability, completing a sequence it announced in March. At that time the team said it had found a critica…

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