Vyper is a Pythonic Smart Contract Language for the ethereum virtual machine. In versions 0.3.1 through 0.3.7, the Vyper compiler generates the wrong bytecode. Any contract that uses the raw_call
with revert_on_failure=False
and max_outsize=0
receives the wrong response from raw_call
. Depending on the memory garbage, the result can be either True
or False
. A patch is available and, as of time of publication, anticipated to be part of Vyper 0.3.8. As a workaround, one may always put max_outsize>0
.
docs.vyperlang.org/en/v0.3.7/built-in-functions.html
github.com/lidofinance/gate-seals/blob/051593e74df01a4131c485b4fda52e691cd4b7d8/contracts/GateSeal.vy
github.com/lidofinance/gate-seals/pull/5/files
github.com/vyperlang/vyper/commit/851f7a1b3aa2a36fd041e3d0ed38f9355a58c8ae
github.com/vyperlang/vyper/security/advisories/GHSA-w9g2-3w7p-72g9