Posted by Solidity Team on December 18, 2025

Solidity is a programming language for writing smart contracts on the Ethereum blockchain, offering tools and resources for building decentralized applications (DApps) and blockchain solutions. Developers can learn about smart contract development, Ethereum development tools, and decentralized finance (DeFi) to create secure and reliable blockchain applications using Solidity.

Solidity

A bug in the Solidity compiler's code generator caused storage cleanup and copy operations to fail when fixed-length arrays crossed the 2^256-slot storage boundary. The issue stemmed from incorrect pointer-based comparisons that didn't account for wraparound at the storage boundary. While the potential impact is high if triggered, the bug is extremely unlikely to affect real contracts because it requires deliberately placing arrays at the storage boundary, which bypasses normal compiler safeguards. The bug existed since version 0.1.0 and was fixed in version 0.8.32. Both IR and evmasm compilation pipelines were affected, with the fix replacing pointer-based iteration with index-based iteration to correctly handle wraparound cases.

Lost Storage Array Write on Slot Overflow Bug