The wETH market did not experience a “borrowed asset deficiency” in the sense intended by the Umbrella design, because the deficiency was caused by invalid collateral, not by any failure of the wETH market or its stakers. Therefore, wETH stakers should not be slashed.
1. A “borrowed asset deficiency” only applies when the borrowed asset’s own market fails
Umbrella’s slashing logic is built around a simple principle:
If an asset is borrowed and the protocol cannot recover it due to a failure in that asset’s own market, its stakers absorb the loss.
Example
The borrowed asset depegs
The borrowed asset becomes illiquid
The borrowed asset’s oracle fails
The borrowed asset’s risk parameters were misconfigured
None of these happened to wETH.
wETH remained:
fully backed
liquid
correctly priced
functioning normally
So the wETH market did not fail.
2. The deficiency was caused by invalid collateral, not by wETH
The attacker deposited unbacked rsETH created through a bridge exploit.
This means:
The collateral was fake
The borrow was legitimate
The deficiency arose because the collateral evaporated, not because wETH malfunctioned
This is a collateral‑side failure, not a borrowed‑asset failure.
Umbrella’s design is explicit:
Slashing is tied to the asset whose risk caused the loss.
3. If wETH stakers are slashed here, the Umbrella model becomes meaningless
If you slash wETH stakers for a collateral failure, you create a dangerous precedent:
Any asset could be used as collateral
If that collateral fails, the borrowed asset’s stakers get slashed
This destroys risk isolation
Stakers would have to underwrite every collateral asset in the protocol
That is the opposite of what Umbrella was designed to do.
4. Borrowed‑asset slashing only makes sense when the borrowed asset’s stakers mispriced risk
wETH stakers did not misprice anything.
They did not take on rsETH bridge risk.
They did not vote on rsETH parameters.
They did not underwrite rsETH’s cross‑chain security.
Slashing them would be punishing the wrong group.
5. The attacker’s choice to borrow wETH does not make wETH responsible
The attacker could have borrowed:
USDC
wBTC
DAI
or any other liquid asset
The choice of wETH was arbitrary and based on liquidity.
The borrowed asset is not responsible for the collateral’s failure.
Although the Umbrella contract mentions slashing for “borrowed asset deficiency,” this situation does not qualify as such. A borrowed‑asset deficiency occurs when the borrowed asset’s own market fails—through depeg, illiquidity, oracle malfunction, or mispriced risk. In this case, wETH functioned perfectly. The deficiency arose because the collateral (unbacked rsETH) was invalid due to an external bridge exploit. This is a collateral‑side failure, not a borrowed‑asset failure. Slashing wETH stakers would violate Umbrella’s core principle of per‑asset risk isolation and would incorrectly punish stakers who did not underwrite rsETH or its bridge risk. Therefore, wETH stakers should not be slashed.
Thank you Aave for at least taking the care and time of thinking this one through
