CVE-2026-44003CWE-693

vm2: Transformer Fast-Path Bypass Exposes Internal State Variable

Medium · published May 13, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
27.6
In the wild
Unconfirmed
What it is

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.0, vm2's code transformer has a performance optimization that skips AST analysis when the code does not contain catch, import, or async keywords. This fast-path bypass allows sandboxed code to directly access the internal VM2_INTERNAL_STATE_DO_NOT_USE_OR_PROGRAM_WILL_FAIL variable, which exposes internal security functions (handleException, wrapWith, import). This vulnerability is fixed in 3.11.0.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00351 · 27.6th percentile
Weakness
CWE-693 · Protection Mechanism Failure
Published
2026-05-13T17:30Z
EPSS history
Timeline
  • 13 MAY 17:30Z
    vm2: Transformer Fast-Path Bypass Exposes Internal State Variable
    cvelistv5