CVE-2020-37286

8.3 HIGH 0.3% exploit odds Fix listed Memory safety Library

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data tampering.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-10-21 01:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-27 22:17 UTC Last updatedMost recent change to the record

Details

Published: 2026-10-21 01:17 UTC
Last modified: 2026-10-27 22:17 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Weakness: CWE-787 · Out-of-bounds write
Record status: Deferred

Attack profile CVSS 4.0 · 8.3

Attack vector: Network
Complexity: Low
Attack requirements: Present
Privileges needed: None
User interaction: None
Confidentiality: None
Integrity: High
Availability: Low

Raw vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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Fix and advisories

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

References

NVD record · CVE.org record