vm2: GHSA-m283-3h24-438v fix bypass leads to host RCE via call/apply indirection
## Summary Untrusted JavaScript run by vm2 can escape the sandbox and execute arbitrary commands in the host Node.js process when an embedder-exposed host Promise rejects. This is an incomplete fix for GHSA-m283-3h24-438v: the advisory's capability-bearing rejection rebuild runs only through this direct Promise-handler path, so call/apply indirection bypasses the protection it introduced. The bridge sanitises host rejection values before sandbox callbacks run, but the gate at `lib/bridge.js:1624` identity-checks only the direct call target. Registering the rejection handler through `Function.prototype.call` indirection, `p.then.call(p, undefined, cb)`, makes the intercepted target host `Function.prototype.call`, so the sanitiser never runs and the raw host error reaches the sandbox (`lib/bridge.js:1639`) without the rebuild that strips host references carried by its own properties (`lib/setup-sandbox.js:2104`). A rejection error whose own property references a powerful host object, for example `err.detail = process`, therefore reaches sandbox code as a fully functional proxy, and `e.detail.mainModule.require('child_process').execSync(...)` executes with host privileges. The `.apply` form and a stacked `call.call` behave identically. ## PoC Save as `poc.js` and run `node poc.js`: ```js const { VM } = require('vm2'); const vm = new VM({ sandbox: { fetchUser: async () => { const err = new Error('db connection failed'); err.detail = process; // embedder-attached host reference th
GHSA-647f-g98j-qq25
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:GHSA-647f-g98j-qq25
vm2
Source reference: /affected/0/package/name
- Affected versions
- 3.11.6
Source reference:
/affected/0/versions - Fixed versions
- 3.11.7
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "3.11.6"
},
{
"fixed": "3.11.7"
}
]
}
],
"package": {
"name": "vm2",
"purl": "pkg:npm/vm2",
"ecosystem": "npm"
},
"versions": [
"3.11.6"
],
"database_specific": {
"source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-647f-g98j-qq25/GHSA-647f-g98j-qq25.json"
}
}
]- Related CVEs
- CVE-2026-92937
Source reference:
/aliases
Publisher severity
critical
Source reference: /database_specific/severity
- Event
- #61274 · Revision 1
- Added to Heist Feed
- Publisher date