High severity · published Aug 17, 2026
CVE-2026-47683
vm2: bufferAllocLimit cap bypassed by Buffer.concat and Buffer.from arrayLike
8.7
CVSS
0.5%
EPSS
No
On KEV
Description
vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.6, the bufferAllocLimit enforcement in lib/setup-sandbox.js does not cover Buffer.concat(list, totalLength) or Buffer.from(arrayLike) with an attacker-controlled length, allowing sandbox code to perform large synchronous host external-memory allocations that bypass the configured cap and can exhaust the host process. This issue is fixed in version 3.11.6.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VM
vm2 · patriksimek
< 3.11.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-47683
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-47683
github.com
https://github.com/patriksimek/vm2/commit/3ffb315512e634cf85c447375e85d6c83d00a4bd
github.com
https://github.com/patriksimek/vm2/releases/tag/3.11.6
github.com
https://github.com/patriksimek/vm2/security/advisories/GHSA-gmc2-2x9w-cgh9
More from vm2
10.0
CVE-2026-93606
vm2 before 3.12.1 Sandbox Escape via Promise Symbol.species
10.0
CVE-2026-93605
vm2 NodeVM before 3.12.1 Remote Code Execution via child_process
10.0
CVE-2026-93603
vm2 before 3.12.1 Sandbox Escape RCE via Non-Strict Host Function
10.0
CVE-2026-92960
vm2 before 3.11.6 Process-wide State Exposure via os and dns
10.0
CVE-2026-92956
vm2 3.10.1 through 3.11.6 Sandbox Escape via WebAssembly.compileStreaming