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Advisory record · GHSA-vg88-3v92-rjx2

Vyper: Return inside for loop more than 1 level deep

CVSS 6.3 MediumEPSS 0.0035 · 28th percentile

Published by the GitHub Advisory Database at 6 Oct 2026, 15:20 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
vyperPyPI>=0.1.0b10, <0.2.30.2.3
Identifiers
GHSA-vg88-3v92-rjx2 · CVE-2020-37288
Weakness (CWE)
CWE-670 · CWE-691
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 from 0.1.0b10 before 0.2.3 are affected. A return statement inside a for loop in a nested internal call makes the transaction revert with an invalid jump destination, and the source says this could enable a denial-of-service attack on public contracts under certain conditions. Upgrade to Vyper 0.2.3. The source lists a workaround: avoid returning from inside a for loop that is nested two or more internal calls deep.

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
6.3 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0035, the 28th 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.