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

Quick assessment

Affected
vyperlang vyper
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vyper是EVM 的 Pythonic 智能合约语言。 Vyper v0.3.8之前版本存在安全漏洞，该漏洞源于包含大数组的合约的存储布局不正确。

CVSS 7.5 · High EPSS 0.70% · P52

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-46247

Vulnerability Information
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Vulnerability Title
Vyper has incorrect storage layout for contracts containing large arrays
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
Off-by-one错误
Source: CVE Program / CVE List V5
Vulnerability Title
Vyper 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vyper是EVM 的 Pythonic 智能合约语言。 Vyper v0.3.8之前版本存在安全漏洞，该漏洞源于包含大数组的合约的存储布局不正确。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vyperlang vyper < 0.3.8 -

II. Public POCs for CVE-2023-46247

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7134 chars
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III. Intelligence Information for CVE-2023-46247

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Patches & Fixes for CVE-2023-46247 (1)

Vendor Advisories for CVE-2023-46247 (1)

Other References for CVE-2023-46247 (1)

IV. Related Vulnerabilities

Same product: vyper
Same vendor: vyperlang
Same weakness: CWE-193

V. Comments for CVE-2023-46247

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