vm2 sandbox escape on Node.js 26 through a stale PromiseThenLookupChain protector

vm2 (npm)

## Reporter - Name or handle: `[YMsora]` - Report date: 2026-08-14 ## Summary The latest published vm2 release, **3.11.5**, and the current `main` branch are vulnerable to a sandbox escape when used on Node.js 26. An ordinary fulfilled Promise created by an async function can retain an attacker-controlled `constructor[Symbol.species]` across…

First seen: 1 Oct 2026
Last update: 1 Oct 2026, 15:28 UTC
Fixed in: vm2 3.11.7
Identifiers: CVE-2026-92944
CVSS: 9.8
Source: GitHub advisory
On the menu as: npm packages
Node.js

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## vm2 sandbox escape on Node.js 26 through a stale PromiseThenLookupChain protector
Severity: critical. Patch status: patched.
Affected: vm2 (npm)
Fixed in: vm2 3.11.7
Ids: CVE-2026-92944

## Reporter - Name or handle: `[YMsora]` - Report date: 2026-08-14 ## Summary The latest published vm2 release, **3.11.5**, and the current `main` branch are vulnerable to a sandbox escape when used on Node.js 26. An ordinary fulfilled Promise created by an async function can retain an attacker-controlled `constructor[Symbol.species]` across…

## Steps
1. Search every lockfile and manifest (package-lock.json, yarn.lock, pnpm-lock.yaml, requirements*.txt, poetry.lock, uv.lock, composer.lock, go.sum, Cargo.lock, Gemfile.lock) for `vm2`. For each hit, compare the installed version with the fix on the same major line: vm2 3.11.7. If it's lower, give the exact upgrade command for the package manager this repo uses.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-92944") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://github.com/advisories/GHSA-27g9-p43v-cw3v https://github.com/patriksimek/vm2/commit/c7df2e21d2c74038a1f1750f40f9fe603ec69c6a https://github.com/patriksimek/vm2/releases/tag/v3.11.7 https://github.com/patriksimek/vm2/security/advisories/GHSA-27g9-p43v-cw3v https://nvd.nist.gov/vuln/detail/CVE-2026-92944
https://pwned.coffee/i/vm2-sandbox-escape-on-node-js-26-through-a-stale-promise-cve-2026-92944

Sources

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