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CVE-2026-47135

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

Published: Jun 12, 2026Updated: Jun 12, 2026 Sources: CVE List NVD
NVD MITRE
8.7CVSS
HIGH

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.

EPSS Score
0.1%
Top 78.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:CC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None

Weaknesses

CWE-693

Affected Products

vm2
patriksimek
OSS Libraries / npm
patriksimekoss-projectOSS Libraries

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://github.com/patriksimek/vm2/security/advisories/GHSA-m5q2-4fm3-vfqp
github.com
https://github.com/patriksimek/vm2/commit/928aef51898b5c52a05f05a40c4cfeb52e172878
github.com
https://github.com/patriksimek/vm2/releases/tag/v3.11.4
github.com

Timeline

Published
Jun 12, 2026
Last Updated
Jun 12, 2026

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