Node.js CVE-2026-22686
CRITICAL
GHSA-7qm7-455j-5p63
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
4Blast Radius
ecosystem impact- 9 npm packages depend on enclave-vm (2 direct, 7 indirect)
Ecosystem-wide dependent count for version 2.7.0.
DescriptionGitHub Advisory
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.
AnalysisAI
enclave-vm JavaScript sandbox (before 2.7.0) has a critical sandbox escape. When a tool invocation fails, a host-side Error object is exposed to sandboxed code, which can use its prototype chain to access the host Node.js runtime. Maximum CVSS 10.0 with scope change. PoC available, patch available.
Technical ContextAI
When a tool call fails, enclave-vm exposes a host Error object to the sandbox (CWE-94). The Error retains its host realm prototype chain. Sandboxed code traverses the prototype chain to access host-side constructors, enabling arbitrary code execution in the host Node.js process.
RemediationAI
Update to enclave-vm 2.7.0 or later. This is critical for any AI agent sandbox deployment.
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Same weakness CWE-94 – Code Injection
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External POC / Exploit Code
Leaving vuln.today