GHSA-633r-hq9m-c4ff: vm2 (CVE-2026-92949)

Package	Ecosystem	Affected	Fixed in
vm2	npm	>=3.9.6, <3.11.7	3.11.7

Machine-written summary

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

Versions 3.9.6 up to but not including 3.11.7 of the npm package vm2 are affected. Untrusted JavaScript running inside a VM or NodeVM can bypass vm.freeze() or vm.readonly() when the frozen host object has an accessor (get/set) property, by reading the host setter out and calling it directly, which lets the sandbox change host properties the embedder marked read-only. The source notes that no unusual options are needed, and that the impact depends on what the embedder froze, with data properties not affected. Upgrade to vm2 3.11.7.

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

Score	Rating	CVSS	Vector	Source
6.3	Medium	4.0	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0032, the 24th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

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