Is Balancer V2 Safe?
Risk Grade: C- (52/100)
Balancer V2 is rated as elevated risk — multiple novel mechanisms and notable interaction risks.
High risk — legacy DEX with catastrophic exploit history ($128M in 2025), immutable contracts across multiple chains, and incomplete migration to V3 leaving residual exposure
Balancer V2 is the legacy version of the Balancer decentralized exchange, still running across multiple blockchains with $74M in deposits. It allows flexible pool designs with custom asset ratios. However, V2 suffered a devastating $128M exploit in November 2025 from a math error in its stable pool code, causing over half its TVL to flee. V2 is being phased out in favor of V3, but legacy pools remain live and carry elevated risk.
TVL
$46M
Mechanisms
7
Interactions
5
Value Grade
D-
Key Risks for Balancer V2 Users
Balancer V2 was exploited for $128M in November 2025 — the largest DEX hack at its scale. The same codebase still runs on multiple chains. While the specific bug was in composable stable pools, the V2 code is aging and may harbor additional undiscovered issues
V2 contracts cannot be upgraded. If another vulnerability is found, the only option is to migrate liquidity — which takes time and coordination across multiple chains. Your funds may be at risk during that window
V2 is being replaced by V3, which means development attention and security resources are shifting away. Remaining V2 pools may not receive the same security scrutiny going forward
Top Risk Factors
- •$128M exploit in November 2025 via rounding error in composable stable pool invariant — the largest DEX exploit at that scale in DeFi history
- •Legacy V2 contracts remain deployed across multiple chains with known vulnerability classes; migration to V3 is incomplete
- •58% TVL collapse post-exploit ($775M to $258M) signals deep erosion of protocol trust and institutional confidence
Risk Score Breakdown
Balancer V2's highest risk area is Track Record (15/15). Here's how each dimension contributes to the overall 52/100 score:
Read the Full Balancer V2 Risk Report
This protocol has 3 collapse scenarios. 2 critical and 1 high-severity interaction risks identified. See the full mechanism classification, interaction matrix, and deep-dive recommendations.
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