CVE-2024-32481— vyper's range(start, start + N) reverts for negative numbers
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I. Basic Information for CVE-2024-32481
Vulnerability Information
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Vulnerability Title
vyper's range(start, start + N) reverts for negative numbers
Source: NVD (National Vulnerability Database)
Vulnerability Description
Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. Starting in version 0.3.8 and prior to version 0.4.0b1, when looping over a `range` of the form `range(start, start + N)`, if `start` is negative, the execution will always revert. This issue is caused by an incorrect assertion inserted by the code generation of the range `stmt.parse_For_range()`. The issue arises when `start` is signed, instead of using `sle`, `le` is used and `start` is interpreted as an unsigned integer for the comparison. If it is a negative number, its 255th bit is set to `1` and is hence interpreted as a very large unsigned integer making the assertion always fail. Any contract having a `range(start, start + N)` where `start` is a signed integer with the possibility for `start` to be negative is affected. If a call goes through the loop while supplying a negative `start` the execution will revert. Version 0.4.0b1 fixes the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
数值类型间的不正确转换
Source: NVD (National Vulnerability Database)
Vulnerability Title
Vyper 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vyper是EVM 的 Pythonic 智能合约语言。 Vyper 0.3.8至0.4.0b1之前版本存在安全漏洞，该漏洞源于stmt.parse_For_range()函数存在错误断言问题。
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-2024-32481
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- https://github.com/vyperlang/vyper/security/advisories/GHSA-ppx5-q359-pvwjx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2024-32481
Same Patch Batch · vyperlang · 2024-04-25 · 6 CVEs total
| CVE-2024-32649 | 5.3 MEDIUM | vyper performs double eval of the argument of sqrt |
| CVE-2024-32648 | 5.3 MEDIUM | vyper default functions don't respect nonreentrancy keys |
| CVE-2024-32647 | 5.3 MEDIUM | vyper performs double eval of raw_args in create_from_blueprint |
| CVE-2024-32646 | 5.3 MEDIUM | vyper performs double eval of the slice args when buffer from adhoc locations |
| CVE-2024-32645 | 5.3 MEDIUM | vyper performs incorrect topic logging in raw_log |
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-2025-27105
AugAssign evaluation order causing OOB write within the obje
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-2025-27105
AugAssign evaluation order causing OOB write within the obje
Same weakness: CWE-681
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iccDEV: UB at IccIO.cpp
V. Comments for CVE-2024-32481
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