CVE-2021-48018

High

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.

SeverityHigh

CVSS7.4

Exploit probability—

Product

Vyper

PublishedOct 21, 2026

First seenOct 21, 2026

Weakness typeCWE-787Out-of-bounds write

How to fix

Update

vyper0.2.15 or later

Vendor advisories

github.com/vyperlang/vyper/security/advisories/GHSA-7f92-rr6w-cq64

Affected products

Product	Affected versions	Fixed in
vyperPyPI	0.2.13 ≤ v < 0.2.15	0.2.15

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