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CVE-2026-114118— Vyper 0.3.4 through 0.5.0b1 create_from_blueprint Offset Validation Bypass via Unsigned Wraparound

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 0.3.4 至 0.5.0b1 版本在 函数中，使用 减法计算剩余蓝图大小，但未先检查 是否小于蓝图的代码尺寸。因此，过大的偏移量会发生回绕，变为一个较小的正值。若攻击者能够控制 ，则可使工厂部署没有运行时代码的合约，进而导致 ETH 和代币被锁定（无法取出）。

CVSS 4.8 · Medium

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-114118

Vulnerability Information
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Vulnerability Title
Vyper 0.3.4 through 0.5.0b1 create_from_blueprint Offset Validation Bypass via Unsigned Wraparound
Source: CVE Program / CVE List V5
Vulnerability Description
Vyper 0.3.4 through 0.5.0b1 computes the remaining blueprint size in create_from_blueprint by uint256 subtraction without first checking that code_offset is below the blueprint's code size, so a huge offset wraps to a small positive value. An attacker controlling code_offset can make a factory deploy contracts with no runtime code, potentially trapping ETH and tokens.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
数值类型间的不正确转换
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vyperlang vyper 0.3.4 ~ 0.5.0b1 -

II. Public POCs for CVE-2026-114118

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III. Intelligence Information for CVE-2026-114118

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Other References for CVE-2026-114118 (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-2026-114115 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
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-681

V. Comments for CVE-2026-114118

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