CVE-2025-27105
EPSS 0.33%AugAssign evaluation order causing OOB write within the object in Vyper
描述
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. In other words, the following code ```vyper def poc(): a: DynArray[uint256, 2] = [1, 2] a[1] += a.pop() ``` is equivalent to: ```vyper def poc(): a: DynArray[uint256, 2] = [1, 2] a[1] += a[len(a) - 1] a.pop() ``` rather than: ```vyper def poc(): a: DynArray[uint256, 2] = [1, 2] s: uint256 = a[1] t: uint256 = a.pop() a[1] = s + t # reverts due to oob access ```
受影響套件(2)
- PyPI/vyperfrom 0, < 0.4.1
- PyPI/vyperfrom 0, < 0.4.1
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N |