CVE-2020-37286

Medium

Description

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 appear inside tuples or nested calls. Contracts using such calls as tuple elements, call arguments, or builtin arguments like concat or ecrecover can return corrupted values or pass wrong arguments to external calls.

SeverityMedium

CVSS6.5

Exploit probability—

Product

Vyper

PublishedOct 21, 2026

First seenOct 21, 2026

Weakness typeCWE-787Out-of-bounds write

How to fix

Update

vyper0.2.6 or later

Vendor advisories

github.com/vyperlang/vyper/security/advisories/GHSA-2r3x-4mrv-mcxf

Affected products

Product	Affected versions	Fixed in
vyperPyPI	v < 0.2.6	0.2.6

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