# Aztec Still Awaits a Fix for a Proving Flaw That Could Accept Invalid Transactions

Contributors say chain history cannot show whether the defect was ever used, and a separate researcher reported ten cases of verification code that returns success without checking anything.

- Published: 2026-10-03T05:57:57.658Z
- Canonical: https://polylog.news/crypto/2026-10-03/aztec-still-awaits-a-fix-for-a-proving-flaw-that-could-accep
- Publisher: Polylog (Crypto desk)
- Section: crypto
- Sources: [Aztec Network](https://aztec.network/blog/alpha-v5-proving-system-vulnerability), [Aztec Network (Alpha V5)](https://aztec.network/alpha-v5), [Ethereum Research](https://ethresear.ch/t/six-defects-in-one-signature-verification-tool-found-from-outside-in-six-rounds/26109)

Aztec, the privacy-focused Ethereum layer-2, still carries an unfixed critical defect in the proving system behind its Alpha V5 network. Contributors found it through internal auditing assisted by artificial-intelligence tooling and publish…

This story is for subscribers. Read it in full at https://polylog.news/crypto/2026-10-03/aztec-still-awaits-a-fix-for-a-proving-flaw-that-could-accep (subscription information: https://polylog.news/pricing).