CVE-2026-47135

HIGH

vm2: Sandbox escape via unblocked cross-realm Symbol.for keys + missing bridge write-trap symbol checks

Title source: cna
STIX 2.1

Description

vm2 is an open source vm/sandbox for Node.js. Prior to version 3.11.4, Symbol.for override in setup-sandbox.js only intercepts 2 of 9 dangerous Node.js cross-realm symbols. Combined with the bridge's set/defineProperty/deleteProperty traps having no isDangerousCrossRealmSymbol key check, sandbox code can obtain real cross-realm symbols, write them to host objects, and control host-side behavior — verified with a full util.promisify hijack chain. This issue has been patched in version 3.11.4.

References (3)

Core 3

Scores

CVSS v3 8.7
EPSS 0.0044
EPSS Percentile 35.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-693
Status published
Products (2)
npm/vm2 0 - 3.11.4npm
patriksimek/vm2 < 3.11.4
Published Jun 12, 2026
Tracked Since Jun 12, 2026