CVE-2024-32646 — vyper performs double eval of the slice args when buffer from adhoc locations

2026-10-06T04:26:35.120136+00:00

Affected: vyperlang vyper

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. In versions 0.3.10 and prior, using the `slice` builtin can result in a double eval vulnerability when the buffer argument is either `msg.data`, `self.code` or `

.code` and either the `start` or `length` arguments have side-effects. It can be easily triggered only with the versions `<0.3.4` as `0.3.4` introduced the unique symbol fence. No vulnerable production contracts were found. Additionally, double evaluation of side-effects should be easily discoverable in client tests. As such, the impact is low. As of time of publication, no fixed versions are available.

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CVE-2024-32646 — vyper performs double eval of the slice args when buffer from adhoc locations