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bdu:2026-06910

EUVD-2026-364310

fkie_cve-2026-44004

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.0, sandboxed code can call Buffer.alloc() with an arbitrary size to allocate memory directly on the host heap. Because Buffer.alloc is a synchronous C++ native call, vm2's timeout option cannot interrupt it. A single request can exhaust host memory and crash the process with a FATAL ERROR: Reached heap limit. This vulnerability is fixed in 3.11.0.

GHSA-6785-pvv7-mvg7 — vm2 Sandbox Access to Host Buffer.alloc Allows timeout Bypass Resulting in Memory Exhaustion

Affected: npm: vm2

### Summary Sandboxed code can call `Buffer.alloc()` with an arbitrary size to allocate memory directly on the host heap. Because `Buffer.alloc` is a synchronous C++ native call, vm2's `timeout` option cannot interrupt it. A single request can exhaust host memory and crash the process with a `FATAL ERROR: Reached heap limit`.

### Details In `lib/vm.js:58`, `Buffer` is exposed to the sandbox through the `HOST` object. The bridge proxy (`lib/bridge.js`) passes `Buffer.alloc()` calls to the host without any size validation.

Key technical distinction from regular JavaScript memory exhaustion (e.g., `while(true) a.push(...)`): - **JavaScript loops**: V8 can interrupt via timeout — vm2's `timeout` option works - **`Buffer.alloc(N)`**: Executes as a single synchronous C++ call — V8 timeout has no opportunity to interrupt

This means: 1. `timeout: 5000` does NOT protect against this attack 2. A single call allocates the entire requested size at once 3. In memory-constrained environments (Docker, Lambda, Kubernetes pods), this causes immediate OOM crash

Tested amplification factor: ~100 bytes HTTP request — 1,000,000:1 or greater (100 bytes request to 100MB+ host heap allocation).

### PoC

**Library-level PoC (Node.js script — primary):** ```javascript const { VM } = require("vm2"); const vm = new VM({ timeout: 5000 });

// Buffer.alloc bypasses timeout — allocates 100MB on host heap const result = vm.run(`Buffer.alloc(1024*1024*100).length`); console.log(result); // 104857600 —…

RHSA-2026:50850 — Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.1 security update

shell-quote: shell-quote: Arbitrary code execution via command injection due to unescaped line terminators vm2: vm2: Arbitrary code execution via sandbox escape vm2: vm2: Remote code execution due to path restriction bypass via symlinks vm2: vm2: Remote code execution via NodeVM builtin allowlist bypass vm2: vm2: Sandbox escape allows direct interaction with host objects vm2: vm2: Sandbox escape leads to Denial of Service vm2: vm2: Information disclosure through unsanitized host paths vm2: vm2: Sandbox escape due to code transformer optimization bypass vm2: vm2: Denial of Service via host memory exhaustion vm2: vm2: Sandbox Escape leading to Arbitrary Code Execution vm2: vm2: Sandbox escape via arbitrary prototype access leading to arbitrary code execution vm2: vm2: Arbitrary code execution via nested NodeVM bypass vm2: vm2: Arbitrary code execution due to sandbox escape vm2: vm2: Arbitrary Code Execution via Sandbox Escape vm2: vm2: Arbitrary Code Execution due to sandbox escape vulnerability vm2: vm2: Arbitrary code execution via sandbox escape vulnerability vm2: vm2: Sandbox escape allows arbitrary code execution on the host system vm2: vm2: Sandbox escape leading to arbitrary code execution via security bypass vm2: vm2: Sandbox escape via internal HTTP built-ins leading to network restriction bypass vm2: vm2: Arbitrary code execution due to incomplete sandbox restrictions vm2: vm2: NodeVM observability builtins leak host process and HTTP request data vm2: vm2: Integrity…