Vulnerability details
CVE-2026-47683
patriksimek vm2
vm2: bufferAllocLimit cap bypassed by Buffer.concat and Buffer.from arrayLike
CVSS 4.0
8.7High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.7High | 4.0 | CVEProject cvelistV5 (CNA) (GitHub_M) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| patriksimek | vm2 | < 3.11.6 | CVEProject cvelistV5 (CNA) |
References and advisories
3- https://github.com/patriksimek/vm2/commit/3ffb315512e634cf85c447375e85d6c83d00a4bd x_refsource_MISC
- https://github.com/patriksimek/vm2/releases/tag/3.11.6 x_refsource_MISC
- https://github.com/patriksimek/vm2/security/advisories/GHSA-gmc2-2x9w-cgh9 x_refsource_CONFIRM
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Details
- Published
- 2026-08-18
- Last updated
- 2026-08-18
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.53%
Probability of exploitation in 30 days
45.4%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-770Allocation of Resources Without Limits or Throttling