CVE-2023-46247

published 2023-12-13

CVE-2023-46247: Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine (EVM). Contracts containing large arrays might underallocate the number of slots…

Priority P3 38 high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I H A N

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine (EVM). Contracts containing large arrays might underallocate the number of slots they need by 1. Prior to v0.3.8, the calculation to determine how many slots a storage variable needed used `math.ceil(type_.size_in_bytes / 32)`. The intermediate floating point step can produce a rounding error if there are enough bits set in the IEEE-754 mantissa. Roughly speaking, if `type_.size_in_bytes` is large (> 2**46), and slightly less than a power of 2, the calculation can overestimate how many slots are needed by 1. If `type_.size_in_bytes` is slightly more than a power of 2, the calculation can underestimate how many slots are needed by 1. This issue is patched in version 0.3.8.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
vyperlang	vyper	< 0.3.8	0.3.8
vyperlang	vyper	>= 0 < 0bb7203b584e771b23536ba065a6efda457161bb	0bb7203b584e771b23536ba065a6efda457161bb
vyperlang	vyper	>= 0 < 0.3.8	0.3.8

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-193 CWE-682