CVE-2021-48020
Vyper before 0.3.0 Memory Corruption via Internal Function Calls in Arrays
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-787 |
| Vendor | vyperlang |
| Product | vyper |
| Published | Oct 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
Low
Affected Versions
vyperlang / vyper
0.1.0b4 < 0.3.0