CVE-2021-48020
Medium · 6.5CVSS
6.5
EPSS
0.3%
Published
Oct 21, 2026
CISA due date
—
The record
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
| Ecosystem | Package | Introduced | Fixed |
|---|
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