Bug 2557986 (CVE-2021-48018) - CVE-2021-48018 vyper: Vyper: Contract state corruption via overlapping reentrancy lock allocation
Summary: CVE-2021-48018 vyper: Vyper: Contract state corruption via overlapping reentr...
Keywords:
Status: NEW
Alias: CVE-2021-48018
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2565621
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-21 00:57 UTC by OSIDB Bzimport
Modified: 2026-11-03 07:42 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-10-21 00:57:39 UTC 
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.
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