CVE-2021-48020
Published:October 21, 2026
Updated:October 21, 2026
Vyper from 0.1.0b4 before 0.3.0 contains a memory corruption vulnerability caused by an incorrect stack tip pointer when internal function calls are performed inside arrays. Contracts placing internal calls in nested array elements, external call arguments, struct literals, or raw_log topics can have memory corrupted, producing incorrect contract behavior.
Affected Packages
https://github.com/vyperlang/vyper.git (GITHUB):
Affected version(s) >=v0.1.0-beta.4 <v0.3.0Fix Suggestion:
Update to version v0.3.0vyper (PYTHON):
Affected version(s) >=0.1.0b4 <0.3.0Fix Suggestion:
Update to version 0.3.0Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
LOW
Weakness Type (CWE)
Out-of-bounds Write
EPSS
Base Score:
0.28