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CVE-2020-37288— Vyper 0.1.0b10 before 0.2.3 Invalid Jump Destination via Return in Nested Loops

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.

Vyper 从 0.1.0b10 版本到 0.2.3 版本（不含）在生成代码时存在缺陷：当内部函数中的 循环内包含 语句，且该函数被嵌套调用两次或更多次时，生成的代码会产生无效的跳转目标，导致栈下溢。受影响的智能合约会因此错误地回滚相关调用；在特定有限场景下，这可能对公开合约造成拒绝服务（DoS）攻击。

CVSS 3.7 · Low

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2020-37288

Vulnerability Information
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Vulnerability Title
Vyper 0.1.0b10 before 0.2.3 Invalid Jump Destination via Return in Nested Loops
Source: CVE Program / CVE List V5
Vulnerability Description
Vyper from 0.1.0b10 before 0.2.3 generates incorrect code for a return statement inside a for loop in an internal function called two or more internal calls deep, producing an invalid jump destination (stack underflow). Affected contracts revert such calls unnecessarily, which in limited circumstances could enable denial of service against public contracts.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
控制流实现总是不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vyperlang vyper 0.1.0b10 ~ 0.2.3 -

II. Public POCs for CVE-2020-37288

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III. Intelligence Information for CVE-2020-37288

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Other References for CVE-2020-37288 (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-2020-37289 3.7 LOW Vyper before 0.3.1 Improper Input Validation of uint8 Interface Return Values

IV. Related Vulnerabilities

Same product: vyper
Same vendor: vyperlang
Same weakness: CWE-670

V. Comments for CVE-2020-37288

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