High 8.7Published Aug 17, 2026

CVE-2026-47683vm2: bufferAllocLimit cap bypassed by Buffer.concat and Buffer.from arrayLike

Updated under an hour ago (2026-10-19 09:40 UTC)

Does this affect you?

It affects patriksimek vm2. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for patriksimek vm2

Exploited in the last 30 days

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.

CVSS: 8.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Aug 18, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

patriksimek vm2 patriksimek:vm2 (from the name)	before 3.11.6	CNA record

References

https://github.com/patriksimek/vm2/security/advisories/GHSA-gmc2-2x9w-cgh9x-refsource-confirm
https://github.com/patriksimek/vm2/commit/3ffb315512e634cf85c447375e85d6c83d00a4bdx-refsource-misc
https://github.com/patriksimek/vm2/releases/tag/3.11.6x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.