CVE-2025-27105— AugAssign evaluation order causing OOB write within the object in Vyper
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I. Basic Information for CVE-2025-27105
Vulnerability Information
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Vulnerability Title
AugAssign evaluation order causing OOB write within the object in Vyper
Source: NVD (National Vulnerability Database)
Vulnerability Description
vyper is a Pythonic Smart Contract Language for the EVM. Vyper handles AugAssign statements by first caching the target location to avoid double evaluation. However, in the case when target is an access to a DynArray and the rhs modifies the array, the cached target will evaluate first, and the bounds check will not be re-evaluated during the write portion of the statement. This issue has been addressed in version 0.4.1 and all users are advised to upgrade. There are no known workarounds for this vulnerability.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存写
Source: NVD (National Vulnerability Database)
Vulnerability Title
Vyper 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vyper是vyperlang开源的一个 EVM 的 Pythonic 智能合约语言。 Vyper存在安全漏洞，该漏洞源于动态数组操作边界检查不当。
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
II. Public POCs for CVE-2025-27105
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Same Patch Batch · vyperlang · 2025-02-21 · 3 CVEs total
| CVE-2025-26622 | sqrt doesn't define rounding behavior in Vyper | |
| CVE-2025-27104 | double eval in For List Iter in Vyper |
IV. Related Vulnerabilities
Same product: vyper
- CVE-2025-47774
Vyper's `slice()` may elide side-effects when output length - CVE-2025-47285
Vyper's `concat()` builtin may elide side-effects for zero-l - CVE-2025-26622
sqrt doesn't define rounding behavior in Vyper - CVE-2025-27104
double eval in For List Iter in Vyper - CVE-2025-21607
Success of Certain Precompile Calls not Checked in Vyper
Same vendor: vyperlang
- CVE-2025-47774
Vyper's `slice()` may elide side-effects when output length - CVE-2025-47285
Vyper's `concat()` builtin may elide side-effects for zero-l - CVE-2025-26622
sqrt doesn't define rounding behavior in Vyper - CVE-2025-27104
double eval in For List Iter in Vyper - CVE-2025-21607
Success of Certain Precompile Calls not Checked in Vyper
V. Comments for CVE-2025-27105
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