High severity · published Oct 21, 2026
CVE-2021-48018
Vyper 0.2.13 before 0.2.15 Storage Corruption via @nonreentrant Decorator
7.4
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 33% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VY
vyper · vyperlang
0.2.13 before 0.2.15 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-48018
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-48018
github.com
https://github.com/vyperlang/vyper/security/advisories/GHSA-7f92-rr6w-cq64
www.vulncheck.com
https://www.vulncheck.com/advisories/vyper-0.2.13-before-0.2.15-storage-corruption-via-nonreentrant-decorator
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