Yearn

Yearn published a thread breaking down the collapse of Stream Finance, which lost hundreds of millions to circular leverage. Depositors saw $520M TVL at 12-18% stablecoin APY in October 2025, but only $160M actually existed; DeFiLlama refused to count the loops and showed ~$200M. Stream held ~90% of Elixir's deUSD supply, which was itself backed by Stream's xUSD token.

Yearn notes the loop failed to unwind cleanly because Stream suspended redemptions, lending markets hit 100% utilization freezing withdrawals, and oracles hardcoded xUSD at $1 so liquidations never fired, creating bad debt. It also flags that multiple risk curators were exposed to the risky protocols, leaving users who trusted them holding the bag.

Yearn announced that yvFlexUSDC is now available on the flexmeow platform. It is an allocator vault managed by the Yearn Curation team, expanding the set of strategies users can access through the facility.

• New allocator vault targeting USDC yield
• Managed by the Yearn Curation team
• Announced via Yearn's official X account (retweet of flexmeow)

Yearn's flexmeow product, live for 107 days, shipped v1.1. The update lets users loop yvUSD (unlocked), ysyBOLD, and yvcrvUSD-2, expanding the strategies available through the facility.

• v1.1 adds looping support for three Yearn tokens
• Announced via Yearn's official X account

Yearn introduced a new vault, yvcrvUSD-2, which automatically finds the best crvUSD yield opportunities on mainnet and optimizes allocation across them. The vault is described as a "household loop" that scans crvUSD markets to direct capital toward the highest-yielding strategies.

• New Yearn vault targeting crvUSD yield on Ethereum mainnet
• Automates allocation across the best available crvUSD opportunities
• Announced via Yearn's official X account

Yearn acknowledged a market manipulation incident involving reUSD and confirmed it has no exposure to reUSD PTs or reUSD itself, saying it is not impacted. The protocol said it is actively following the situation and implementing measures to prevent this kind of manipulation in its own markets.

Yearn acknowledged an exploit of Term Finance's vault contracts. While Term Finance's contracts are built on Yearn's V3 architecture, Yearn says the exploit came through a custom governance wrapper around the vaults, and that this attack vector does not apply to standard Yearn vault setups. Funds were reportedly affected in the incident.

Yearn built a tool to help users quantify how depositing larger amounts affects the advertised APY of a Yearn vault. Deploying capital to a yield opportunity reduces the APY, and Yearn's strategies already account for this impact whenever vaults shift capital between opportunities.

The tool lets users pick a vault, enter a value, and see the resulting APY impact.

Yearn's risk team upgraded Fluid from a 1.4 (Minimal) to a 2.6 (Medium) risk level, publishing a detailed breakdown of the drivers behind the change.

• The core concern is sUSDai, a synthetic dollar backed by AI-hardware loans issued by USDai. Fluid holds roughly two-thirds of the total sUSDai supply with limited exit liquidity — 24h onchain volume is about 0.2% of market cap and the asset has traded as low as $0.796.
• The concentration was first flagged in April at 19.9%, reached 28.3% in May (prompting a 30% trigger), hit 30.6% on July 6, and now sits at 31.2%.
• sUSDai uses the same LayerZero yield-bearing wrapper pattern as wstUSR, a setup tied to $21M in bad debt on Fluid in March. The sUSDai OAdapter can mint canonical Arbitrum supply, and the 10M/hr limit is outbound-only.
• Collateralization (2.75 → 4.0), Dependencies (2.5 → 4.0) and Provability (1.0 → 2.5) scores all rose, partly because ~37% of lending TVL depends on offchain inputs. Yearn says the full report is public and notes Fluid has responded well since March.