← The Polylog Crypto Intelligence Brief
Morning Edition · Saturday, October 31, 2026Published at 1:43 AM EDT · New York
Aztec discloses a critical flaw in its Alpha V5 proving system that left the network unable to tell which transactions it should have rejected
An AI-assisted internal audit found the bug on July 27, and the fix ships in V6. Aztec has also declared its Noir circuit language stable at version 1.0 and set a 2030 target for post-quantum migration.
Aztec, the privacy-focused Ethereum layer-2 network, disclosed a critical vulnerability in the proving system of its V5 Alpha network. An attacker could build a proof that passes verification for a transaction the network should reject. Thi…
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Part of a tracked trend
Proving-System Bugs Become a Distinct Rollup Risk
Soundness defects in zero-knowledge proving systems will keep surfacing as a risk class separate from smart-contract exploits, because validator re-execution — the fallback most rollups rely on — cannot catch them, forcing teams into embargoed disclosure timed to upgrades and pushing users toward proof-system diversity and escape hatches.
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