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CVE-2020-37289— Vyper before 0.3.1 Improper Input Validation of uint8 Interface Return Values

Quick assessment

Affected
vyperlang vyper
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Vyper 0.3.1 版本之前，由于缺少 uint8 类型，导致将接口返回值声明为 uint8 的函数（例如 ERC20.decimals()）返回的值，在未经边界检查的情况下被存储到 uint256 变量中。恶意合约可以返回大于 255 的数值，从而操纵或绕过依赖这些值的合约逻辑。

CVSS 3.7 · Low

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-37289

Vulnerability Information
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Vulnerability Title
Vyper before 0.3.1 Improper Input Validation of uint8 Interface Return Values
Source: CVE Program / CVE List V5
Vulnerability Description
Vyper before 0.3.1 lacks a uint8 type, allowing interface return values declared as uint8, such as ERC20.decimals(), to be stored in uint256 variables without bounds checking. Malicious contracts can return values greater than 255 to manipulate or bypass contract logic that relies on these values.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vyperlang vyper 0 ~ 0.3.1 -

II. Public POCs for CVE-2020-37289

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III. Intelligence Information for CVE-2020-37289

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Other References for CVE-2020-37289 (2)

Same Patch Batch · vyperlang · 2026-10-21 · 12 CVEs total

CVE-2021-48018 7.4 HIGH Vyper 0.2.13 before 0.2.15 Storage Corruption via @nonreentrant Decorator
CVE-2021-48020 6.5 MEDIUM Vyper before 0.3.0 Memory Corruption via Internal Function Calls in Arrays
CVE-2020-37286 6.5 MEDIUM Vyper 0.1.0b4 before 0.3.0 Memory Corruption via Nested Internal Function Calls
CVE-2026-114117 5.9 MEDIUM Vyper 0.3.8 through 0.5.0b1 Optimizer Miscompilation of msg.value | K in Ternary Branches
CVE-2020-37287 5.9 MEDIUM Vyper before 0.2.6 Call Stack Corruption via Complex Type Function Arguments
CVE-2026-114116 5.3 MEDIUM Vyper through 0.5.0b1 Literal Value Manipulation via Line Separators
CVE-2026-114114 5.3 MEDIUM Vyper through 0.5.0b1 Literal Value Substitution via Multi-byte Characters
CVE-2021-48019 4.8 MEDIUM Vyper before 0.2.9 Incorrect RETURNDATASIZE in create_forwarder_to Proxies
CVE-2026-114118 4.8 MEDIUM Vyper 0.3.4 through 0.5.0b1 create_from_blueprint Offset Validation Bypass via Unsigned Wr
CVE-2026-114115 3.7 LOW Vyper 0.3.8 through 0.5.0b1 Memory Misread via Ternary Nested Array Selection
CVE-2020-37288 3.7 LOW Vyper 0.1.0b10 before 0.2.3 Invalid Jump Destination via Return in Nested Loops

IV. Related Vulnerabilities

Same product: vyper
Same vendor: vyperlang
Same weakness: CWE-20

V. Comments for CVE-2020-37289

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