CVSS 3.1 Score 5.3 of 10 (medium)


Published Oct 25, 2023
Updated: Nov 6, 2023
CWE ID 471


CVE-2023-46232 is a vulnerability affecting era-compiler-vyper, the EraVM Vyper compiler for zkSync Era, a layer 2 rollup using zero-knowledge proofs to scale Ethereum. The bug occurs in versions prior to 1.3.10 and prevents the initialization of the first immutable variable for Vyper contracts meeting specific criteria. The issue arises when there is a String or Array with more allocated 256-bit words than initialized, resulting in the second word's index being unset and effectively set to 0. This overwrites the first immutable value in the ImmutableSimulator. Upgrading and redeploying affected contracts is the recommended solution, as it fixes the problem by setting all indexes in advance. While this vulnerability poses a medium risk with low integrity impact and no confidentiality impact, it can potentially be exploited over a network without requiring any privileges or user interaction.

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