Direct answer · §03 Auditing

What is the most common vulnerability in ZK systems?

Short answer

Underconstrained circuits. The great majority of exploitable findings in production ZK code are not breaks of the cryptography but circuits that accept witnesses which do not correspond to a correct execution — a missing range check, an unconstrained intermediate signal, an unchecked division, an unenforced boolean. The proof is valid; it simply proves a weaker statement than the designers intended. See Section 03.

By MarketComp Updated 2026-09-12 v1.3 About the authors Changelog

Cite this page

MarketComp (2026). What is the most common vulnerability in ZK systems?. The ZK Field Manual (Version 1.3). MarketComp. https://zkpick.com/faq/what-is-the-most-common-vulnerability-in-zk-systems/

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  title        = {What is the most common vulnerability in ZK systems? — The ZK Field Manual},
  author       = {MarketComp},
  year         = {2026},
  version      = {1.3},
  howpublished = {\url{https://zkpick.com/faq/what-is-the-most-common-vulnerability-in-zk-systems/}},
  note         = {Accessed: YYYY-MM-DD}
}