# Balancer v2’s Overlooked Guard 

Source: https://medium.com/@okcontract/balancer-v2s-overlooked-guard-a6847a49e0a4
Kiwi News: https://news.kiwistand.com/stories/Balancer-v2s-Overlooked-Guard?index=0x6908b5e0da0a9ec30b6df904b17e769bb89edb293b18fe5f4133b1135990f9432acd18e0
Submitted by 0xf9f9...736D on 2025-11-03 UTC, 6 upvotes, 1 comment

## Summary

Balancer v2 Vaults saw rapid outflows from multiple pools on several chains, with early loss estimates ranging from about $70M to $117M while responders were still isolating the impact. Researchers including kebabsec noted that in the suspicious calls ops.sender equaled msg.sender, and suggested that a state change during withdrawal proxy setup was the root cause. OKcontract, which is building Chainwall Protocol, cites 2025 loss data dominated by social engineering, cloud keys and front-end tampering to argue that defenses must span both code and operations.

## Comments

**tim**: https://farcaster.xyz/horsefacts.eth/0x99033f2a

Horsefacts said 2hrs ago that most people don‘t know yet how the contract was exploited