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Advisory record · GHSA-4v7v-gqf9-ww2g

Vyper: Call stack corruption when passing complex type containing non-base type members as argument

CVSS 8.2 HighEPSS 0.0025 · 16th percentile

Published by the GitHub Advisory Database at 6 Oct 2026, 15:22 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
vyperPyPI<0.2.60.2.6
Identifiers
GHSA-4v7v-gqf9-ww2g · CVE-2020-37287
Weakness (CWE)
CWE-131 · CWE-682
Tags
Published
6 Oct 2026
Updated
24 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Vyper versions before 0.2.6 mishandle complex arguments such as multi-dimensional arrays or structs with non-base-type members, passed to internal or external functions, because the compiler assumes each subtype occupies 32 bytes. This corrupts the call stack and produces incorrect output. The source does not describe what an attacker would need beyond writing contracts that use such arguments. Upgrade to Vyper 0.2.6 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.2 High 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0025, the 16th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:07 UTC First seen by agentprime
  2. 31 Oct 2026, 14:07 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.