User Defined Value Types Bug

On September 28th, 2021, Harry Altman (@haltman-at) of Truffle discovered a bug in user defined value types. The bug has no influence on the correctness of Solidity contracts, but contracts compiled with Solidity 0.8.8 that use the new feature are unnecessarily wasteful and might have problems with tooling or contract upgrades. The bug exists only in Solidity 0.8.8 and is fixed in 0.8.9. We assigned the bug a severity of “very low”. [Read More]

Solidity 0.8.9 Release Announcement

Solidity v0.8.9 is a pure bugfix release and fixes two important, but low severity, bugs. The first bug is related to immutables of signed integer types shorter than 256 bits. The bug causes sign extension (cleanup) of those values to not always being properly performed. It was introduced in Solidity 0.6.5. Read more in the respective security alert. The second bug was introduced with user defined value types in Solidity v0.8.8 (released two days ago). User defined types with underlying... [Read More]

Signed Immutables Bug

On September 28th, 2021, the Solidity team discovered that for immutable variables of a signed integer type shorter than 256 bits, sign extension (cleanup) of its value is not always properly performed. To our knowledge, the value can only be accessed in its unclean state when using inline assembly. The bug is present since the introduction of the immutable feature in Solidity 0.6.5 and is fixed in 0.8.9. We assigned the bug a severity of “very low”. [Read More]

Solidity 0.8.8 Release Announcement

Solidity v0.8.8 introduces user defined value types as a major feature. The override keyword is now optional for interface functions, immutable variables can be read in the constructor, there is support for retrieving the smallest and largest value of an enum, you can specify include directories and the commandline interface was cleaned up. Furthermore, we fixed several bugs and the SMTChecker has improved language coverage. [Read More]

Solidity 0.8.7 Release Announcement

Solidity v0.8.7 introduces support for the London upgrade, includes various improvements to Yul to EVM code transformation, the SMTChecker and some bugfixes. Please note: Unfortunately, the npm package of this version is corrupted. Pulling the solc-js repository directly will work. [Read More]

What Happened with Solidity-related Domains?

Some time ago we decided to get a domain that the Solidity team has easy access to in order to streamline efforts and initiatives that were hosted on other domains before. And so soliditylang.org was born! 🎉 We announced most of these domain changes individually on Twitter, but we want to take a moment to also officially announce it here on the blog and explain the various subdomains we have now, what they are for and which older domains may... [Read More]