Answer in brief
CVE-2026-47683 records a High severity vulnerability in vm2: bufferAllocLimit cap bypassed by Buffer.concat and Buffer.from arrayLike. The current sources do not mark it as known exploited. The current feed maps patriksimek/vm2 (generic), vm2 (npm), vm2 (npm). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps patriksimek/vm2 (generic), vm2 (npm), vm2 (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| patriksimek/vm2generic | < 3.11.6 | Not reported |
| vm2npm | >=0 <3.11.6 | 3.11.6 |
| vm2npm | <=3.11.5 | 3.11.6 |
Published upstream
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 17, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-47683 records a High severity vulnerability in vm2: bufferAllocLimit cap bypassed by Buffer.concat and Buffer.from arrayLike. The current sources do not mark it as known exploited. The current feed maps patriksimek/vm2 (generic), vm2 (npm), vm2 (npm). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps patriksimek/vm2 (generic), vm2 (npm), vm2 (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| patriksimek/vm2generic | < 3.11.6 | Not reported |
| vm2npm | >=0 <3.11.6 | 3.11.6 |
| vm2npm | <=3.11.5 | 3.11.6 |
Published upstream
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 17, 2026
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.
Quoted source text, attributed separately from HOL analysis.