Description
vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.3, it is possible to catch a host exception using the yield* expression inside an async generator. When the generator is closed using the return function, the value is awaited on and exceptions thrown in the then call will be caught by the runtime and passed to the yield* iterator as the next value. This allows attackers to write code which can escape from the VM2 sandbox and execute arbitrary commands on the host system. This vulnerability is fixed in 3.11.3.
References (1)
Core 1
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/patriksimek/vm2/security/advisories/GHSA-248r-7h7q-cr24
Scores
CVSS v3
9.8
EPSS
0.0008
EPSS Percentile
23.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
total
Details
CWE
CWE-668
Status
published
Products (3)
npm/vm2
0 - 3.11.3npm
patriksimek/vm2
< 3.11.3
vm2_project/vm2
< 3.11.3
Published
May 13, 2026
Tracked Since
May 13, 2026