CVE-2021-48018 Details
Description
Vyper from 0.2.13 before 0.2.15 allocates storage slots for @nonreentrant reentrancy locks at the same locations as contract storage variables. When a function using @nonreentrant is called, setting the lock overwrites the overlapping storage variable, corrupting contract state and breaking the contract's intended logic.
A vulnerability in Vyper versions 0.2.13 prior to 0.2.15 allows for storage corruption when using the @nonreentrant decorator. The issue arises because the reentrancy locks are allocated in the same storage slots as contract variables. When a function with the @nonreentrant decorator is called, the lock overwrites the corresponding storage variable, leading to corruption of the contract state and disruption of the intended logic.
Users can upgrade to Vyper version 0.2.15, where this issue has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 21, 2026CISA-ADP
Assessed Oct 23, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-787 | Out-of-bounds Write | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Vyper | >= 0.2.13, < 0.2.15 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 23, 2026 | CVE Modified | CISA-ADP |
| Oct 21, 2026 | New CVE Received | [email protected] |