Answer in brief
CVE-2026-77077 records a High severity (CVSS 7.2) vulnerability in n8n before 1.123.69 Remote Code Execution via EventEmitter Prototype Pollution. The current sources do not mark it as known exploited. The current feed maps n8n-io/n8n (generic), n8n-io/n8n (generic), n8n-io/n8n (generic), n8n-io/n8n (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.2. 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 n8n-io/n8n (generic), n8n-io/n8n (generic), n8n-io/n8n (generic), n8n-io/n8n (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:n8n:n8n:2.34.0:*:*:*:*:node.js:*:* | Not reported | Not reported |
| cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| n8n-io/n8ngeneric | >=0 <2.34.1 | 2.34.1 |
| n8n-io/n8ngeneric | >=0 <2.33.4 | 2.33.4 |
| n8n-io/n8ngeneric | >=2.34.0 <2.34.1 | 2.34.1 |
| n8n-io/n8ngeneric | >=2.0.0 <2.33.4 | 2.33.4 |
| n8n-io/n8ngeneric | >=0 <1.123.69 | 1.123.69 |
Published upstream
Aug 20, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 20, 2026
n8n versions before 1.123.69, 2.33.4, and 2.34.1 contain a JavaScript task runner VM sandbox escape. The runner's prototype-freezing routine covers globalThis functions but not internal module constructors such as EventEmitter, allowing an authenticated user with Code node access to exploit prototype pollution to execute arbitrary commands within the runner container. Because the polluted prototype is a process-wide object, the corruption persists across other tenants' Code node executions on the same shared runner. On v1.x instances without task runners enabled, Code node JavaScript runs directly in the main n8n process, where the impact could be higher.
Quoted source text, attributed separately from HOL analysis.