Individual skill
upgrade-safety
Upgrade vulnerability detection and prevention for Solidity proxy contracts. Use when implementing UUPS, Transparent, or Diamond proxy patterns. Covers uninitialized proxy attacks, storage collisions, selector clashing, and upgrade safety validation tools.
skills/upgrade-safety/SKILL.md
Source commit a53141f10a1bbf9c634e44af6bc5a29dd1660697
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- Last checked
- Nov 7, 2026
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- Repository last updated
- Oct 23, 2026
- License
- MIT
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- security Derived category
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# Upgrade Safety
## Uninitialized Proxy
The most common upgrade vulnerability. If `initialize()` isn't called on the proxy immediately after deployment, an attacker can front-run and take ownership.
```solidity
// VULNERABLE: deployment and initialization are separate transactions
// Deploy proxy → attacker calls initialize() before admin
proxy = new ERC1967Proxy(implementation, "");
// ...gap where attacker calls initialize()...
VaultV1(proxy).initialize(admin);
// SAFE: initialize in the deployment transaction