Vyper has incorrect storage layout for contracts containing large arrays
CVE-2023-46247

7.5HIGH

Key Information:

Vendor

vyperlang

Status
vyper
Vendor
CVE Published:
13 December 2023

What is CVE-2023-46247?

The Vyper Smart Contract Language for the Ethereum Virtual Machine contains a flaw in its calculation for determining the number of storage slots required for large arrays. Prior to version 0.3.8, the algorithm for calculating the storage needed using math.ceil(type_.size_in_bytes / 32) can result in inaccurate slot allocation due to floating-point precision errors. Specifically, this may lead to underallocation or overallocation of storage slots when dealing with arrays that are sized near a power of 2, which can compromise the integrity and functionality of smart contracts.

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Affected Version(s)

vyper < 0.3.8

References

https://github.com/vyperlang/vyper/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/vyperlang/vyper/commit/0bb7203b584e771...
x_refsource_MISC
https://github.com/vyperlang/vyper/blob/6020b8bbf66b062d2...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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