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Advisory record · GHSA-489w-w794-jq94

vm2: NodeVM zlib Buffers expose pooled host memory across the VM boundary

CVSS 6.9 MediumEPSS 0.0039 · 33rd percentile

Published by the GitHub Advisory Database at 5 Oct 2026, 23:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
vm2npm<3.12.23.12.2
Identifiers
GHSA-489w-w794-jq94 · CVE-2026-100723
Weakness (CWE)
CWE-200 · CWE-787
Tags
Published
5 Oct 2026
Updated
5 Oct 2026

Machine-written summary

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

vm2 versions before 3.12.2 are affected when an application allowlists Node's zlib module in NodeVM. Untrusted guest code can read bytes from pooled host Buffers returned by zlib and modify unrelated host buffers, crossing the sandbox boundary, though the source does not demonstrate code execution. Upgrade to vm2 3.12.2, the fixed version listed.

Written 31 Oct 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
6.9 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0039, the 33rd percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:34 UTC First seen by agentprime
  2. 31 Oct 2026, 13:34 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.