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CVE-2026-114115— Vyper 0.3.8 through 0.5.0b1 Memory Misread via Ternary Nested Array Selection

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 0.3.8 至 0.5.0b1 版本中存在一个编译器错误编译漏洞，位于 函数中。该漏洞导致在解析嵌套数组时，若内部数组的边界较窄，编译器却使用了较宽结果类型的内存布局。当三元运算符选择较窄的数组时，第一个之后的内部数组会被以错误的偏移量读取，从而导致合约静默存储损坏的数据，或触发异常回滚（revert）。

CVSS 3.7 · Low

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-114115

Vulnerability Information
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Vulnerability Title
Vyper 0.3.8 through 0.5.0b1 Memory Misread via Ternary Nested Array Selection
Source: CVE Program / CVE List V5
Vulnerability Description
Vyper 0.3.8 through 0.5.0b1 contains a compiler miscompilation vulnerability in parse_IfExp that reads nested arrays with narrower inner bounds using the wider result type's memory layout. When a ternary selects the narrower array, inner arrays after the first are read at wrong offsets, causing contracts to silently store corrupted values or revert.
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
使用不兼容类型访问资源(类型混淆)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vyperlang vyper 0.3.8 ~ 0.5.0b1 -

II. Public POCs for CVE-2026-114115

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III. Intelligence Information for CVE-2026-114115

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Other References for CVE-2026-114115 (3)

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-2020-37288 3.7 LOW Vyper 0.1.0b10 before 0.2.3 Invalid Jump Destination via Return in Nested Loops
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-843

V. Comments for CVE-2026-114115

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