CVE-2023-46247

HIGH EPSS 48.2%
Published Dec 13, 20232y ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Dec 13, 2023 2y ago
Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
48.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-193
CWE-682

Affected Products 1

VendorProductVersionRange
vyperlangvyper* <0.3.8

References 3

  • github.com https://github.com/vyperlang/vyper/blob/6020b8bbf66b062d299d87bc7e4eddc4c9d1c157/vyper/semantics/validation/data_positions.py#L197
    Product
  • github.com https://github.com/vyperlang/vyper/commit/0bb7203b584e771b23536ba065a6efda457161bb
    Patch
  • github.com https://github.com/vyperlang/vyper/security/advisories/GHSA-6m97-7527-mh74
    Third Party Advisory

Remediation

  • github.com https://github.com/vyperlang/vyper/commit/0bb7203b584e771b23536ba065a6efda457161bb
    Patch