# Index Coop Issuance Contract Hit by a Time-of-Check Bug as DeFi Exploit Losses Keep Compounding

A newly documented reentrancy-style flaw in a token issuance flow joins a run of smaller protocol drains catalogued this week across lending, perpetuals, and cross-chain venues.

- Published: 2026-08-02T05:31:41.327Z
- Canonical: https://polylog.news/crypto/2026-08-02/index-coop-issuance-contract-hit-by-a-time-of-check-bug-as-d
- Publisher: Polylog (Crypto desk)
- Section: crypto
- Sources: [DeFiHackLabs](https://github.com/SunWeb3Sec/DeFiHackLabs/commit/9d599c284fb444e7b4a1a870073b0a32ab94b580), [Rekt News](https://www.rekt.news/)

Security researchers have published a proof of concept for a time-of-check-to-time-of-use flaw in Index Coop's ExchangeIssuance contract, the component that mints and redeems structured index tokens. In this class of bug, the contract valid…

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